Remove unnecessary 'extern's.

Change-Id: Iba2b3fb6ff88e504f1657b915120ae43d58a1e03
diff --git a/libc/include/fnmatch.h b/libc/include/fnmatch.h
index 772b4ef..1a5348b 100644
--- a/libc/include/fnmatch.h
+++ b/libc/include/fnmatch.h
@@ -44,9 +44,8 @@
 #define FNM_IGNORECASE   FNM_CASEFOLD
 #define FNM_FILE_NAME    FNM_PATHNAME
 
-extern int  fnmatch(const char *pattern, const char *string, int flags);
+int fnmatch(const char* pattern, const char* string, int flags);
 
 __END_DECLS
 
 #endif /* _FNMATCH_H */
-