Move macOS build to 64 bit

• Requires SDK 10.8 at /Users/Shared/Developer/SDKs/MacOSX10.8.sdk
• Upgraded all dependencies (e.g. SDL with better fullscreen handling)
• Direct support for HDPI displays postponed

src/framework/Makefile

@@ -26,7 +26,8 @@ FRAMEWORK_INSTALL?=$(PWD)
 CXX?=g++
 
 # variables
-CPPFLAGS += $(shell $(FRAMEWORK_INSTALL)/bin/sdl-config --cflags)
+CPPFLAGS += -I$(FRAMEWORK_INSTALL)/include
+CPPFLAGS += $(shell $(FRAMEWORK_INSTALL)/bin/sdl2-config --cflags)
 CPPFLAGS += $(shell $(FRAMEWORK_INSTALL)/bin/freetype-config --cflags)
 CPPFLAGS += $(shell $(FRAMEWORK_INSTALL)/bin/xml2-config --cflags)
 CPPFLAGS += -I$(FRAMEWORK_INSTALL)/include/boinc -I/usr/include