configure.ac: disable -Werror

Disable the mandatory flag -Werror in configure.ac.

Signed-off-by: Karoly Kasza <kaszak@gmail.com>

--- open-vm-tools-9.4.6-1770165.orig/configure.ac	2014-07-02 00:21:14.000000000 +0200
+++ open-vm-tools-9.4.6-1770165/configure.ac	2014-09-15 16:03:47.565900402 +0200
@@ -832,7 +832,7 @@
 
 ### General flags / actions
 CFLAGS="$CFLAGS -Wall"
-CFLAGS="$CFLAGS -Werror"
+# CFLAGS="$CFLAGS -Werror"
 
 # -Wno-unknown-pragmas is due to gcc not understanding '#pragma ident' in Xlib.h on OpenSolaris.
 for TEST_CFLAG in -Wno-pointer-sign -Wno-unused-value -fno-strict-aliasing \