travis: enable tools build on OS X

As we can build tools on OS X we should check we don't break build
when we submit new codes.

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20200302154630.45620-3-lvivier@redhat.com>
Message-Id: <20200303150622.20133-7-alex.bennee@linaro.org>

.travis.yml

@@ -273,6 +273,7 @@ jobs:
 
     - name: "OSX Xcode 10.3"
       env:
+        - BASE_CONFIG="--disable-docs --enable-tools"
         - CONFIG="--target-list=i386-softmmu,ppc-softmmu,ppc64-softmmu,m68k-softmmu,x86_64-softmmu"
       os: osx
       osx_image: xcode10.3