Add FreeType headers dependencies, #8716.

This allows MacDecorator to build once again.

Due to other errors, BeDecorator and WinDecorator do not (yet) fail on the
missing FreeType header -- hence it being only a comment for now.

src/add-ons/decorators/BeDecorator/Jamfile

@@ -10,6 +10,10 @@ UsePrivateHeaders kernel ;
 
 AddResources ClassicBe : resources.rdef ;
 
+#TODO: See #8716, hrev44313 for ft2build.h: No such file or directory
+#Includes [ FGristFiles BeDecorator.cpp ]
+#	: $(HAIKU_FREETYPE_HEADERS_DEPENDENCY) ;
+
 Addon ClassicBe :
 	BeDecorator.cpp
 	: be <nogrist>app_server $(TARGET_LIBSTDC++) $(TARGET_LIBSUPC++)

src/add-ons/decorators/MacDecorator/Jamfile

@@ -12,6 +12,9 @@ UsePrivateHeaders kernel ;
 
 AddResources MacDecorator : resources.rdef ;
 
+Includes [ FGristFiles MacDecorator.cpp ]
+	: $(HAIKU_FREETYPE_HEADERS_DEPENDENCY) ;
+
 Addon MacDecorator :
 	MacDecorator.cpp
 	: be <nogrist>app_server $(TARGET_LIBSTDC++)

src/add-ons/decorators/WinDecorator/Jamfile

@@ -10,6 +10,10 @@ UsePrivateHeaders kernel ;
 
 AddResources WinDecorator : resources.rdef ;
 
+#TODO: See #8716, hrev44313 for ft2build.h: No such file or directory
+#Includes [ FGristFiles WinDecorator.cpp ]
+#	: $(HAIKU_FREETYPE_HEADERS_DEPENDENCY) ;
+
 Addon WinDecorator :
 	WinDecorator.cpp
 	: be <nogrist>app_server $(TARGET_LIBSTDC++)