LFS (large file system?) support in hb-*shap*, hb-view

Fixes https://github.com/behdad/harfbuzz/issues/336

configure.ac

@@ -9,6 +9,8 @@ AC_CONFIG_MACRO_DIR([m4])
 AC_CONFIG_SRCDIR([src/harfbuzz.pc.in])
 AC_CONFIG_HEADERS([config.h])
 
+AC_USE_SYSTEM_EXTENSIONS
+
 AM_INIT_AUTOMAKE([1.11.1 gnits tar-ustar dist-bzip2 no-dist-gzip -Wall no-define color-tests -Wno-portability])
 AM_CONDITIONAL(AUTOMAKE_OLDER_THAN_1_13, test $am__api_version = 1.11 -o $am__api_version = 1.12)
 AM_SILENT_RULES([yes])
@@ -22,6 +24,7 @@ LT_INIT([disable-static])
 AC_PROG_CC
 AM_PROG_CC_C_O
 AC_PROG_CXX
+AC_SYS_LARGEFILE
 PKG_PROG_PKG_CONFIG([0.20])
 AM_MISSING_PROG([RAGEL], [ragel])
 AM_MISSING_PROG([GIT], [git])