Avoid an incorrect R_MIPS_CALL16 relocation with a local symbol.

Index: Zend/asm/make_mips64_n64_elf_gas.S
--- Zend/asm/make_mips64_n64_elf_gas.S.orig
+++ Zend/asm/make_mips64_n64_elf_gas.S
@@ -70,6 +70,7 @@ make_fcontext:
     sd  $gp, 136($v0)
 
     # psudo instruction compute abs address of label finish based on GP
+    .local  finish
     dla  $t9, finish
 
     # save address of finish as return-address for context-function
