get rid of unused "main" function.

confuses gdb.

Change-Id: I1c64357ce122fe5a2564ee96bb4caa32b733f6ea
diff --git a/linker/linker.c b/linker/linker.c
index a188b5c..e4618e3 100644
--- a/linker/linker.c
+++ b/linker/linker.c
@@ -2102,11 +2102,6 @@
     }
 }
 
-int main(int argc, char **argv)
-{
-    return 0;
-}
-
 #define ANDROID_TLS_SLOTS  BIONIC_TLS_SLOTS
 
 static void * __tls_area[ANDROID_TLS_SLOTS];