This patch removes all the handish composition of CFLAGS, LDFLAGS, search for libraries, etc. for Obj-C and instead relies on the system provided makefiles.
The used Makefiles are available on systems supported by GNUStep and Mac OS.
BEWARE that you need to setup the environment setup!
For people who use GNUStep, this procedure is described at http://www.gnustep.org/resources/documentation/User/GNUstep/gnustep-howto_4.html#Environment-Setup