add missing #endif

add missing #endif

Author: zte-majiang

src/runtime/asm_ppc64x.s

@@ -18,6 +18,7 @@
 #else
 #define cgoCalleeStackSize 48
 #endif
+#endif
 
 TEXT runtime·rt0_go(SB),NOSPLIT,$0
 	// R1 = stack; R3 = argc; R4 = argv; R13 = C TLS base pointer