Log Message:
ccache: updated to 3.4.3

ccache 3.4.3

Bug fixes
Fixed a race condition when creating the initial config file in the cache directory.
Bail out on too hard clang option -MJ.
Bail out on too hard option -save-temps=obj.
Handle separate parameter to clang option -target correctly.
Upgraded bundled zlib to version 1.2.11.