Libmv: remove unwind hack from CMake rules.

Such stuff better be solved in glog itself.

Should be pretty safe change since it was defined for CMake only
and AFAIR Jens wanted to get rid of this too.

extern/libmv/CMakeLists.txt

@@ -40,19 +40,6 @@ set(INC_SYS
 	${ZLIB_INCLUDE_DIRS}
 )
 
-
-# XXX - FIXME
-# this is a momentary hack to find unwind.h in 10.6.sdk
-if(APPLE)
-	if(${CMAKE_OSX_DEPLOYMENT_TARGET} STREQUAL "10.6")
-		list(APPEND INC_SYS
-			${CMAKE_OSX_SYSROOT}/Developer/usr/llvm-gcc-4.2/lib/gcc/i686-apple-darwin10/4.2.1/include
-		)
-	endif()
-endif()
-# XXX - END
-
-
 set(SRC
 	libmv-capi.cpp
 	libmv/image/array_nd.cc