travis: for travis generating an extra build

.travis.yml

@@ -6,6 +6,7 @@
 
 os: linux
 language: cpp
+compiler: gcc
 env:
   global:
     - MAKEJOBS=-j3
@@ -41,6 +42,8 @@ matrix:
       env: HOST=x86_64-unknown-linux-gnu DEP_OPTS="NO_WALLET=1" RUN_TESTS=true GOAL="install" BITCOIN_CONFIG="--enable-glibc-back-compat --enable-reduce-exports"
     - compiler: ": Cross-Mac"
       env: HOST=x86_64-apple-darwin11 PACKAGES="cmake libcap-dev libz-dev libbz2-dev" BITCOIN_CONFIG="--enable-reduce-exports" OSX_SDK=10.9 GOAL="deploy"
+  exclude:
+    - compiler: gcc
 install:
     - if [ -n "$PACKAGES" ]; then travis_retry sudo apt-get update; fi
     - if [ -n "$PACKAGES" ]; then travis_retry sudo apt-get install --no-install-recommends --no-upgrade -qq $PACKAGES; fi