Temporarily disable config caching. [appveyor skip]

.travis.yml

@@ -18,7 +18,8 @@ env:
         - CCACHE_SLOPPINESS=file_macro,time_macros,include_file_ctime,include_file_mtime
         - CCACHE_NOHASHDIR=true
         - BUILD_LIBS=$HOME/.libs
-        # Disable some warnings produced by libev especially and also some Cython generated code
+        # Disable some warnings produced by libev especially and also some Cython generated code.
+        # Note that changing the value of these variables invalidates configure caches
         - CFLAGS="-g -pipe -Wno-strict-aliasing -Wno-comment"
         - CPPFLAGS="-I$BUILD_LIBS/include -DEV_VERIFY=3"
         - LDFLAGS="-L$BUILD_LIBS/lib"
@@ -53,9 +54,9 @@ before_install:
   - export PATH=$BUILD_RUNTIMES/snakepit/$TRAVIS_PYTHON_VERSION.d/bin:$PATH
   - export G_SITE=$BUILD_RUNTIMES/snakepit/$TRAVIS_PYTHON_VERSION.d/lib/*/site-packages/
   # Restore the configure caches
-  - if [ -f $BUILD_LIBS/config.cache.ares ]; then cp $BUILD_LIBS/config.cache.ares deps/c-ares/config.cache ; fi
-  - if [ -f $BUILD_LIBS/config.cache.libev ]; then cp $BUILD_LIBS/config.cache.libev deps/libev/config.cache ; fi
-  - if [ -f $BUILD_LIBS/config.cache.libuv ]; then cp $BUILD_LIBS/config.cache.libuv deps/libuv/config.cache ; fi
+  # - if [ -f $BUILD_LIBS/config.cache.ares ]; then cp $BUILD_LIBS/config.cache.ares deps/c-ares/config.cache ; fi
+  # - if [ -f $BUILD_LIBS/config.cache.libev ]; then cp $BUILD_LIBS/config.cache.libev deps/libev/config.cache ; fi
+  # - if [ -f $BUILD_LIBS/config.cache.libuv ]; then cp $BUILD_LIBS/config.cache.libuv deps/libuv/config.cache ; fi
 
 before_script:
   # Show some details of interest