Fixes CVE-2022-35252

Change-Id: I549240f6ae31ae94f925422517cd03ef2e3b5732
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/140411
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>

There's no official MSVC support in ccache yet, but there are patches
in progress of getting upstreamed. So right now it's necessary
to get a patched ccache.
Ccache cannot work with -Zi option, since sharing debuginfo in a .PDB
cannot be cached. Added --enable-z7-symbols that gets enabled
by default if ccache is detected.
It works even with PCHs enabled, and externals seem to work too.
I get almost 100% hit rate on a rebuild, although such a rebuild
is slower than on Linux.

Change-Id: I1d230ee1fccc441b9d9bec794cc2e1ec13161999
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/125179
Tested-by: Jenkins
Reviewed-by: Luboš Luňák <l.lunak@collabora.com>