libgo: fix improperly mangled linker symbol directive

Fix asm name directive for the C version of log/syslog.syslog_c,
which didn't get included in the recent name mangling change.

Change-Id: Ibcee32b955a1ec26cb4a9c9e6aaf10f8bd4b4fb4
Reviewed-on: https://go-review.googlesource.com/c/145017
Reviewed-by: Ian Lance Taylor <iant@golang.org>
diff --git a/libgo/go/log/syslog/syslog_c.c b/libgo/go/log/syslog/syslog_c.c
index 5b33d78..36e7694 100644
--- a/libgo/go/log/syslog/syslog_c.c
+++ b/libgo/go/log/syslog/syslog_c.c
@@ -12,7 +12,7 @@
    can't represent a C varargs function in Go.  */
 
 void syslog_c(intgo, const char*)
-  __asm__ (GOSYM_PREFIX "log_syslog.syslog_c");
+  __asm__ (GOSYM_PREFIX "log..z2fsyslog.syslog_c");
 
 void
 syslog_c (intgo priority, const char *msg)