tools: Remove -Werror everywhere else

The previous changeset, e4f5949c44 ("tools: Add -Werror by default to all
tools/"), added "-Werror" to CFLAGS in tools/Rules.mk.  Remove it from
everywhere else now it is duplicated.

Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Acked-by: Christian Lindig <christian.lindig@citrix.com>
Acked-by: Daniel P. Smith <dpsmith@apertussolutions.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>
Release-acked-by: Henry Wang <Henry.Wang@arm.com>

tools/python/setup.py

@@ -8,7 +8,7 @@ SHLIB_libxenctrl = os.environ['SHLIB_libxenctrl'].split()
 SHLIB_libxenguest = os.environ['SHLIB_libxenguest'].split()
 SHLIB_libxenstore = os.environ['SHLIB_libxenstore'].split()
 
-extra_compile_args  = [ "-fno-strict-aliasing", "-Werror" ]
+extra_compile_args  = [ "-fno-strict-aliasing" ]
 
 PATH_XEN      = XEN_ROOT + "/tools/include"
 PATH_LIBXENTOOLLOG = XEN_ROOT + "/tools/libs/toollog"