sparc: fix sparse warning in math_{32,64}

Fix following sparse warning:
math_{32,64}.c: warning: symbol 'do_mathemu' was not declared. Should it be static?

Add prototype in processor_{32,64} and drop extern in traps_{32,64}.c

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc/include/asm/processor_32.h b/arch/sparc/include/asm/processor_32.h
index 2c7baa4..2bc9818 100644
--- a/arch/sparc/include/asm/processor_32.h
+++ b/arch/sparc/include/asm/processor_32.h
@@ -116,6 +116,7 @@
 #ifdef __KERNEL__
 
 extern struct task_struct *last_task_used_math;
+int do_mathemu(struct pt_regs *regs, struct task_struct *fpt);
 
 #define cpu_relax()	barrier()
 extern void (*sparc_idle)(void);