[SPARC]: Fix weak aliases

sparc_ksyms.c used to declare weak alias to several gcc intrinsics. It
doesn't work with gcc4 anymore - it wants a declaration for the thing
we are aliasing to and that's not going to happen for something like
.mul, etc. Replaced with direct injection of weak alias on the assembler
level - .weak <alias> followed by <alias> = <aliased>; that works on all
gcc versions.

Signed-off-by: Al Viro <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

arch/sparc/kernel/sparc_ksyms.c

···
  * The module references will be fixed up by module_frob_arch_sections.
  */
 #define DOT_ALIAS2(__ret, __x, __arg1, __arg2) \
-	extern __ret __x(__arg1, __arg2) \
-	             __attribute__((weak, alias("." # __x)));
+	extern __ret __x(__arg1, __arg2); \
+	asm(".weak " #__x);\
+	asm(#__x "=." #__x);
 
 DOT_ALIAS2(int, div, int, int)
 DOT_ALIAS2(int, mul, int, int)