travis-ci: speedup osx build by enabling brew cache

1-2 minutes speedup by using brew cache, also ccache is no more disabled for osx build (even it does not speedup significantly, it simplifies the overall script)

---
this is a "v2" of previously issued "enable ccache for osx and mingw builds"
patch. I decided not to enable ccache for mingw builds as it does not speedup them

 .travis.yml           | 5 +++--
 .travis/build-deps.sh | 7 ++-----
 2 files changed, 5 insertions(+), 7 deletions(-)

.travis.yml +3 -2

index 1f669b30..34e0ac04 100644
@@ -82,10 +82,11 @@ cache:
   directories:
   - download-cache
   - ${HOME}/opt
+  - ${HOME}/Library/Caches/Homebrew
 
 before_install:
-  - if [ "${TRAVIS_OS_NAME}" = "osx" ]; then brew update     ; fi
-  - if [ "${TRAVIS_OS_NAME}" = "osx" ]; then brew install lzo; fi
+  - if [ "${TRAVIS_OS_NAME}" = "osx" ]; then brew update            ; fi
+  - if [ "${TRAVIS_OS_NAME}" = "osx" ]; then brew install lzo ccache; fi
 
 install:
   - if [ ! -z "${CHOST}" ]; then unset CC; fi

.travis/build-deps.sh +2 -6

index e787abab..e7036b6b 100755
@@ -130,11 +130,8 @@ build_openssl () {
     fi
 }
 
-# Enable ccache
-if [ "${TRAVIS_OS_NAME}" != "osx" ] && [ -z ${CHOST+x} ]; then
-    # ccache not available on osx, see:
-    # https://github.com/travis-ci/travis-ci/issues/5567
-    # also ccache not enabled for cross builds
+# Enable ccache except cross builds
+if [ -z ${CHOST+x} ]; then
     mkdir -p "${HOME}/bin"
     ln -s "$(which ccache)" "${HOME}/bin/${CC}"
     PATH="${HOME}/bin:${PATH}"
--

2.14.3