Include config.h.in in tree

I typically don't like including generating files in tree.  But like to
make an exception for this, since this forms the canonical list of
options one would need to go through when building with alternative
build systems.

Makefile.am

@@ -20,7 +20,6 @@ MAINTAINERCLEANFILES = \
 	$(srcdir)/autoscan.log \
 	$(srcdir)/compile \
 	$(srcdir)/config.guess \
-	$(srcdir)/config.h.in \
 	$(srcdir)/config.sub \
 	$(srcdir)/configure.scan \
 	$(srcdir)/depcomp \

config.h.in

+/* config.h.in.  Generated from configure.ac by autoheader.  */
+
+/* Define to 1 if you have the <ApplicationServices/ApplicationServices.h>
+   header file. */
+#undef HAVE_APPLICATIONSERVICES_APPLICATIONSERVICES_H
+
+/* Define to 1 if you have the `atexit' function. */
+#undef HAVE_ATEXIT
+
+/* 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 FreeType 2 library */
+#undef HAVE_FREETYPE
+
+/* Define to 1 if you have the `FT_Face_GetCharVariantIndex' function. */
+#undef HAVE_FT_FACE_GETCHARVARIANTINDEX
+
+/* 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 Graphite library */
+#undef HAVE_GRAPHITE2
+
+/* Have gthread2 library */
+#undef HAVE_GTHREAD
+
+/* Have Old HarfBuzz backend */
+#undef HAVE_HB_OLD
+
+/* Have ICU library */
+#undef HAVE_ICU
+
+/* Have ICU Layout Engine library */
+#undef HAVE_ICU_LE
+
+/* Have Intel __sync_* atomic primitives */
+#undef HAVE_INTEL_ATOMIC_PRIMITIVES
+
+/* Define to 1 if you have the <inttypes.h> header file. */
+#undef HAVE_INTTYPES_H
+
+/* Define to 1 if you have the <io.h> header file. */
+#undef HAVE_IO_H
+
+/* Define to 1 if you have the `isatty' function. */
+#undef HAVE_ISATTY
+
+/* Define to 1 if you have the <memory.h> header file. */
+#undef HAVE_MEMORY_H
+
+/* 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 */
+#undef HAVE_OT
+
+/* 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
+
+/* Define to 1 if you have the `sched_yield' function. */
+#undef HAVE_SCHED_YIELD
+
+/* Define to 1 if you have the <stdint.h> header file. */
+#undef HAVE_STDINT_H
+
+/* Define to 1 if you have the <stdlib.h> header file. */
+#undef HAVE_STDLIB_H
+
+/* Define to 1 if you have the <strings.h> header file. */
+#undef HAVE_STRINGS_H
+
+/* Define to 1 if you have the <string.h> header file. */
+#undef HAVE_STRING_H
+
+/* 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. */
+#undef HAVE_SYS_STAT_H
+
+/* Define to 1 if you have the <sys/types.h> header file. */
+#undef HAVE_SYS_TYPES_H
+
+/* Have UCDN Unicode functions */
+#undef HAVE_UCDN
+
+/* Have Uniscribe backend */
+#undef HAVE_UNISCRIBE
+
+/* Define to 1 if you have the <unistd.h> header file. */
+#undef HAVE_UNISTD_H
+
+/* Define to 1 if you have the <usp10.h> header file. */
+#undef HAVE_USP10_H
+
+/* Define to 1 if you have the <windows.h> header file. */
+#undef HAVE_WINDOWS_H
+
+/* Define to 1 if you have the `_setmode' function. */
+#undef HAVE__SETMODE
+
+/* Define to the sub-directory in which libtool stores uninstalled libraries.
+   */
+#undef LT_OBJDIR
+
+/* Define to 1 if your C compiler doesn't accept -c and -o together. */
+#undef NO_MINUS_C_MINUS_O
+
+/* Define to the address where bug reports for this package should be sent. */
+#undef PACKAGE_BUGREPORT
+
+/* Define to the full name of this package. */
+#undef PACKAGE_NAME
+
+/* Define to the full name and version of this package. */
+#undef PACKAGE_STRING
+
+/* Define to the one symbol short name of this package. */
+#undef PACKAGE_TARNAME
+
+/* Define to the home page for this package. */
+#undef PACKAGE_URL
+
+/* Define to the version of this package. */
+#undef 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. */
+#undef STDC_HEADERS