runtime: rename cgocall_errno and asmcgocall_errno into cgocall and asmcgocall

Change-Id: I5917bea8bb35b0e725dcc56a68f3a70137cfc180
Reviewed-on: https://go-review.googlesource.com/9387
Reviewed-by: Ian Lance Taylor <iant@golang.org>
diff --git a/src/runtime/os1_windows.go b/src/runtime/os1_windows.go
index 9565366..bc472d0 100644
--- a/src/runtime/os1_windows.go
+++ b/src/runtime/os1_windows.go
@@ -372,7 +372,7 @@
 		// all three values to be non-zero, it will use them
 		mp.libcallsp = getcallersp(unsafe.Pointer(&fn))
 	}
-	asmcgocall_errno(asmstdcallAddr, unsafe.Pointer(&mp.libcall))
+	asmcgocall(asmstdcallAddr, unsafe.Pointer(&mp.libcall))
 	mp.libcallsp = 0
 	return mp.libcall.r1
 }