Mac: Add QMAKE_FRAMEWORKPATH to compiler command line as well.

This is necessary for the compiler to find include
files following the "#include <FRAMEWORK/file>" syntax.

Change-Id: Ia40b6bbe571e2b275a502c2de60cceeecc9b0f6b
Reviewed-by: Pierre Rossi <pierre.rossi@gmail.com>

tools/qmake/mkspecs/features/gyp_generator.prf

@@ -82,6 +82,12 @@ for (lib, LIBS): GYP_CONTENTS += "      '$$lib',"
 for (rpath, QMAKE_RPATHDIR): GYP_CONTENTS += "      '$$QMAKE_RPATH$$rpath',"
 GYP_CONTENTS += "    ],"
 
+macx {
+    GYP_CONTENTS += "    'mac_framework_dirs': ["
+    GYP_CONTENTS += "      '$$QMAKE_FRAMEWORKPATH',"
+    GYP_CONTENTS += "    ],"
+}
+
 !isEmpty(QMAKE_CFLAGS) {
     GYP_CONTENTS += "    'cflags': ["
     for(flag, QMAKE_CFLAGS): GYP_CONTENTS += "      '$$flag',"