ci: explicitly set PKG_CONFIG_PATH for openssl

travis upgraded to macos high sierra overnight without notification(?)
and this is now required in order to find openssl for some reason

also disable config.cache to prevent configure errors

Differential Revision: https://phab.enlightenment.org/D6718

.ci/ci-configure.sh

@@ -70,7 +70,7 @@ else
 
   export CFLAGS="-I/usr/local/opt/openssl/include -frewrite-includes $CFLAGS"
   export LDFLAGS="-L/usr/local/opt/openssl/lib $LDFLAGS"
-  export LDFLAGS="-L/usr/local/opt/openssl/lib $LDFLAGS"
+  export PKG_CONFIG_PATH="/usr/local/opt/openssl/lib/pkgconfig"
 
   # Normal build test of all targets
   rm -f ~/.ccache/ccache.conf

.travis.yml

@@ -84,10 +84,6 @@ before_script:
       fi
 
   - .ci/ci-ccache-stats.sh
-  - |
-       if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then
-         cp $HOME/cachedir/config.cache . || true
-       fi
 
 script:
   - .ci/ci-configure.sh "$CI_BUILD_TYPE"