Temporary apply LIBC version to __pthread_gettid

This is workaround for http://b/26391427

Bug: http://b/26391427
Change-Id: Ibf5c611cf4c04dfa595644225e6d9503089a18da
diff --git a/libc/libc.mips.map b/libc/libc.mips.map
index df0e4b7..b011410 100644
--- a/libc/libc.mips.map
+++ b/libc/libc.mips.map
@@ -120,6 +120,7 @@
     __pselect6; # arm x86 mips
     __pthread_cleanup_pop;
     __pthread_cleanup_push;
+    __pthread_gettid; # arm x86 mips nobrillo
     __ptrace; # arm x86 mips
     __putlong;
     __putshort;