Actually use CMAKE_ASM_COMPILER for asm, instead of CMAKE_C_COMPILER

Alex

Modules/Compiler/GNU-ASM.cmake

@@ -3,6 +3,6 @@ include(Compiler/GNU)
 
 set(CMAKE_ASM_SOURCE_FILE_EXTENSIONS s;S;asm)
 
-set(CMAKE_ASM_COMPILE_OBJECT "<CMAKE_C_COMPILER> <DEFINES> <FLAGS> -o <OBJECT>   -c <SOURCE>")
+set(CMAKE_ASM_COMPILE_OBJECT "<CMAKE_ASM_COMPILER> <DEFINES> <FLAGS> -o <OBJECT>   -c <SOURCE>")
 
 __compiler_gnu(ASM)