Adding "build_options" to bpy.app, a frozenset containing strings matching optional feature's build defines (like 'FFMPEG', 'MOD_BOOLEAN', 'INTERNATIONAL', etc.) for all enabled elements.

Note I tried to select all interesting defines, but this might be extended if needed...

source/blender/python/intern/bpy_app.c

@@ -34,6 +34,7 @@
 #include "bpy_app.h"
 
 #include "bpy_app_ffmpeg.h"
+#include "bpy_app_build_options.h"
 
 #include "bpy_app_handlers.h"
 #include "bpy_driver.h"
@@ -83,6 +84,7 @@ static PyStructSequence_Field app_info_fields[] = {
 
 	/* submodules */
 	{(char *)"ffmpeg", (char *)"FFmpeg library information backend"},
+	{(char *)"build_options", (char *)"A set containing most important enabled optional build features"},
 	{(char *)"handlers", (char *)"Application handler callbacks"},
 	{NULL}
 };
@@ -148,6 +150,7 @@ static PyObject *make_app_info(void)
 #endif
 
 	SetObjItem(BPY_app_ffmpeg_struct());
+	SetObjItem(BPY_app_build_options_struct());
 	SetObjItem(BPY_app_handlers_struct());
 
 #undef SetIntItem