MSVC builds: Add a pre-configured config.h(.win32) template

This adds a pre-configured config.h template that can be used for Visual
Studio builds, where autotools is not normally available.  This has the
configs that are suitable for Visual Studio builds, as well as all the
features used for Windows builds enabled (HAVE_OT, HAVE_FALLBACK and
HAVE_UNISCRIBE).

Note that the optional features are not enabled here, they are enabled by
/D's (or -D's) in the NMake Makefiles as requested.

win32/config.h.win32.in

+/* config.h.in.  Generated from configure.ac by autoheader.  */
+
+/* The normal alignment of `struct{char;}', in bytes. */
+#define ALIGNOF_STRUCT_CHAR__ 1
+
+/* Define to 1 if you have the `atexit' function. */
+#define HAVE_ATEXIT 1
+
+/* Have cairo graphics library */
+/* #undef HAVE_CAIRO */
+
+/* Have cairo-ft support in cairo graphics library */
+/* #undef HAVE_CAIRO_FT */
+
+/* Have Core Text backend */
+/* #undef HAVE_CORETEXT */
+
+/* Define to 1 if you have the <dlfcn.h> header file. */
+/* #undef HAVE_DLFCN_H */
+
+/* Have simple TrueType Layout backend */
+#define HAVE_FALLBACK 1
+
+/* Have fontconfig library */
+/* #undef HAVE_FONTCONFIG */
+
+/* Have FreeType 2 library */
+/* #undef HAVE_FREETYPE */
+
+/* Define to 1 if you have the `getpagesize' function. */
+/* #undef HAVE_GETPAGESIZE */
+
+/* Have glib2 library */
+/* #undef HAVE_GLIB */
+
+/* Have gobject2 library */
+/* #undef HAVE_GOBJECT */
+
+/* Have Graphite2 library */
+/* #undef HAVE_GRAPHITE2 */
+
+/* Have ICU library */
+/* #undef HAVE_ICU */
+
+/* Have Intel __sync_* atomic primitives */
+/* #undef HAVE_INTEL_ATOMIC_PRIMITIVES */
+
+/* Define to 1 if you have the <inttypes.h> header file. */
+#if !defined (_MSC_VER) || (_MSC_VER >= 1800)
+#define HAVE_INTTYPES_H 1
+#endif
+
+/* Define to 1 if you have the `isatty' function. */
+#define HAVE_ISATTY 1
+
+/* Define to 1 if you have the <memory.h> header file. */
+#define HAVE_MEMORY_H 1
+
+/* Define to 1 if you have the `mmap' function. */
+/* #undef HAVE_MMAP */
+
+/* Define to 1 if you have the `mprotect' function. */
+/* #undef HAVE_MPROTECT */
+
+/* Have native OpenType Layout backend */
+#define HAVE_OT 1
+
+/* Have POSIX threads */
+/* #undef HAVE_PTHREAD */
+
+/* Have PTHREAD_PRIO_INHERIT. */
+/* #undef HAVE_PTHREAD_PRIO_INHERIT */
+
+/* Define to 1 if you have the <sched.h> header file. */
+/* #undef HAVE_SCHED_H */
+
+/* Have sched_yield */
+/* #undef HAVE_SCHED_YIELD */
+
+/* Have Solaris __machine_*_barrier and atomic_* operations */
+/* #undef HAVE_SOLARIS_ATOMIC_OPS */
+
+/* Define to 1 if you have the <stdint.h> header file. */
+#if !defined (_MSC_VER) || (_MSC_VER >= 1600)
+#define HAVE_STDINT_H 1
+#endif
+
+/* Define to 1 if you have the <stdlib.h> header file. */
+#define HAVE_STDLIB_H 1
+
+/* Define to 1 if you have the <strings.h> header file. */
+#ifndef _MSC_VER
+#define HAVE_STRINGS_H 1
+#endif
+
+/* Define to 1 if you have the <string.h> header file. */
+#define HAVE_STRING_H 1
+
+/* Define to 1 if you have the `sysconf' function. */
+/* #undef HAVE_SYSCONF */
+
+/* Define to 1 if you have the <sys/mman.h> header file. */
+/* #undef HAVE_SYS_MMAN_H */
+
+/* Define to 1 if you have the <sys/stat.h> header file. */
+#define HAVE_SYS_STAT_H 1
+
+/* Define to 1 if you have the <sys/types.h> header file. */
+#define HAVE_SYS_TYPES_H 1
+
+/* Have UCDN Unicode functions */
+#define HAVE_UCDN 1
+
+/* Have Uniscribe library */
+#define HAVE_UNISCRIBE 1
+
+/* Define to 1 if you have the <unistd.h> header file. */
+#ifndef _MSC_VER
+#define HAVE_UNISTD_H 1
+#endif
+
+/* Define to 1 if you have the <usp10.h> header file. */
+#define HAVE_USP10_H 1
+
+/* Define to 1 if you have the <windows.h> header file. */
+#define HAVE_WINDOWS_H 1
+
+/* Define to the sub-directory in which libtool stores uninstalled libraries.
+   */
+#define LT_OBJDIR ".libs/"
+
+/* Define to the address where bug reports for this package should be sent. */
+#define PACKAGE_BUGREPORT "@PACKAGE_BUGREPORT@"
+
+/* Define to the full name of this package. */
+#define PACKAGE_NAME "@PACKAGE_NAME@"
+
+/* Define to the full name and version of this package. */
+#define PACKAGE_STRING "@PACKAGE_NAME@ @PACKAGE_VERSION@"
+
+/* Define to the one symbol short name of this package. */
+#define PACKAGE_TARNAME "@PACKAGE_TARNAME@"
+
+/* Define to the home page for this package. */
+#define PACKAGE_URL "@PACKAGE_URL@"
+
+/* Define to the version of this package. */
+#define PACKAGE_VERSION "@PACKAGE_VERSION@"
+
+/* Define to necessary symbol if this constant uses a non-standard name on
+   your system. */
+/* #undef PTHREAD_CREATE_JOINABLE */
+
+/* Define to 1 if you have the ANSI C header files. */
+#define STDC_HEADERS 1