BUG: Fix OS X dylib version flags for more linkers

Some OS X linkers want a 'dylib_' prefix on the -compatiblity_version
and -current_version flags while others do not.  This passes the flags
through gcc instead since it never wants the prefix and translates the
flags for the linker correctly.

Modules/Platform/Darwin.cmake

@@ -27,8 +27,8 @@ SET(CMAKE_SHARED_MODULE_SUFFIX ".so")
 SET(CMAKE_MODULE_EXISTS 1)
 SET(CMAKE_DL_LIBS "")
 
-SET(CMAKE_C_OSX_COMPATIBILITY_VERSION_FLAG -Wl,-compatibility_version,)
-SET(CMAKE_C_OSX_CURRENT_VERSION_FLAG -Wl,-current_version,)
+SET(CMAKE_C_OSX_COMPATIBILITY_VERSION_FLAG "-compatibility_version ")
+SET(CMAKE_C_OSX_CURRENT_VERSION_FLAG "-current_version ")
 SET(CMAKE_CXX_OSX_COMPATIBILITY_VERSION_FLAG "${CMAKE_C_OSX_COMPATIBILITY_VERSION_FLAG}")
 SET(CMAKE_CXX_OSX_CURRENT_VERSION_FLAG "${CMAKE_C_OSX_CURRENT_VERSION_FLAG}")