[committed][gdb/testsuite] Remove duplicate of supports_gnuc

[Tom de Vries via Gdb-patches <gdb-patches@sourceware.org>]

Hi,

In commit 9d9dd861e98 ("[gdb/testsuite] Fix regression in
step-indirect-call-thunk.exp with gcc 7") I accidentally committed a duplicate
of supports_gnuc, which caused:
...
DUPLICATE: gdb.base/gdb-caching-proc.exp: supports_gnuc: consistency
...

Fix this by removing the duplicate.

Tested on x86_64-linux.

Committed to trunk.

Thanks,
- Tom

[gdb/testsuite] Remove duplicate of supports_gnuc

---
 gdb/testsuite/lib/gdb.exp | 11 -----------
 1 file changed, 11 deletions(-)

diff --git a/gdb/testsuite/lib/gdb.exp b/gdb/testsuite/lib/gdb.exp
index ef68c3ce9fb..a8f25b5f0dd 100644
--- a/gdb/testsuite/lib/gdb.exp
+++ b/gdb/testsuite/lib/gdb.exp
@@ -8529,17 +8529,6 @@ gdb_caching_proc supports_gnuc {
     return [gdb_simple_compile $me $src object ""]
 }
 
-# Return 1 if compiler supports __GNUC__, otherwise return 0.
-gdb_caching_proc supports_gnuc {
-    set me "supports_gnuc"
-    set src {
-	#ifndef __GNUC__
-	#error "No gnuc"
-	#endif
-    }
-    return [gdb_simple_compile $me $src object ""]
-}
-
 # Return 1 if target supports mpx, otherwise return 0.
 gdb_caching_proc have_mpx {
     global srcdir