[config] Don't compile disabled features

This makes it possible to include all .cc files into build, even if not
building CoreText, Uniscribe, etc.

This was mostly to help custom builders.  But also means that we can
include all files in our own build system.  Not sure if we should.
Definitely simplifies things, but slightly only.

src/Makefile.am

@@ -424,6 +424,7 @@ HarfBuzz_0_0_gir_CFLAGS = \
 	-DHB_AAT_H_IN \
 	-DHB_GOBJECT_H \
 	-DHB_GOBJECT_H_IN \
+	-DHAVE_GOBJECT \
 	-DHB_EXTERN= \
 	$(NULL)
 HarfBuzz_0_0_gir_LIBS = \

src/hb-coretext.cc

@@ -27,6 +27,9 @@
  */
 
 #include "hb.hh"
+
+#ifdef HAVE_CORETEXT
+
 #include "hb-shaper-impl.hh"
 
 #include "hb-coretext.h"
@@ -1148,3 +1151,6 @@ fail:
 
   return ret;
 }
+
+
+#endif

src/hb-directwrite.cc

@@ -23,6 +23,9 @@
  */
 
 #include "hb.hh"
+
+#ifdef HAVE_DIRECTWRITE
+
 #include "hb-shaper-impl.hh"
 
 #include <DWrite_1.h>
@@ -958,3 +961,6 @@ hb_directwrite_face_get_font_face (hb_face_t *face)
 {
   return face->data.directwrite->fontFace;
 }
+
+
+#endif

src/hb-ft.cc

@@ -29,6 +29,8 @@
 
 #include "hb.hh"
 
+#ifdef HAVE_FREETYPE
+
 #include "hb-ft.h"
 
 #include "hb-font.hh"
@@ -877,3 +879,6 @@ hb_ft_font_set_funcs (hb_font_t *font)
   _hb_ft_font_set_funcs (font, ft_face, true);
   hb_ft_font_set_load_flags (font, FT_LOAD_DEFAULT | FT_LOAD_NO_HINTING);
 }
+
+
+#endif

src/hb-glib.cc

@@ -28,6 +28,8 @@
 
 #include "hb.hh"
 
+#ifdef HAVE_GLIB
+
 #include "hb-glib.h"
 
 #include "hb-machinery.hh"
@@ -404,3 +406,6 @@ hb_glib_blob_create (GBytes *gbytes)
 			 _hb_g_bytes_unref);
 }
 #endif
+
+
+#endif

src/hb-gobject-enums.cc.tmpl

@@ -27,6 +27,8 @@
 
 #include "hb.hh"
 
+#ifdef HAVE_GOBJECT
+
 /* g++ didn't like older gtype.h gcc-only code path. */
 #include <glib.h>
 #if !GLIB_CHECK_VERSION(2,29,16)
@@ -44,6 +46,11 @@
 /* enumerations from "@filename@" */
 /*** END file-production ***/
 
+/*** BEGIN file-tail ***/
+
+#endif
+/*** END file-tail ***/
+
 /*** BEGIN value-header ***/
 GType
 @enum_name@_get_type ()

src/hb-gobject-structs.cc

@@ -26,6 +26,8 @@
 
 #include "hb.hh"
 
+#ifdef HAVE_GOBJECT
+
 
 /**
  * SECTION:hb-gobject
@@ -94,3 +96,6 @@ HB_DEFINE_VALUE_TYPE (user_data_key)
 
 HB_DEFINE_VALUE_TYPE (ot_math_glyph_variant)
 HB_DEFINE_VALUE_TYPE (ot_math_glyph_part)
+
+
+#endif

src/hb-graphite2.cc

@@ -26,6 +26,10 @@
  * Google Author(s): Behdad Esfahbod
  */
 
+#include "hb.hh"
+
+#ifdef HAVE_GRAPHITE2
+
 #include "hb-shaper-impl.hh"
 
 #include "hb-graphite2.h"
@@ -447,3 +451,6 @@ _hb_graphite2_shape (hb_shape_plan_t    *shape_plan HB_UNUSED,
 
   return true;
 }
+
+
+#endif

src/hb-icu.cc

@@ -29,6 +29,8 @@
 
 #include "hb.hh"
 
+#ifdef HAVE_ICU
+
 #include "hb-icu.h"
 
 #include "hb-machinery.hh"
@@ -351,3 +353,6 @@ hb_icu_get_unicode_funcs ()
 {
   return static_icu_funcs.get_unconst ();
 }
+
+
+#endif

src/hb-uniscribe.cc

@@ -25,6 +25,9 @@
  */
 
 #include "hb.hh"
+
+#ifdef HAVE_UNISCRIBE
+
 #include "hb-shaper-impl.hh"
 
 #include <windows.h>
@@ -1023,3 +1026,4 @@ retry:
 }
 
 
+#endif