Don't invoke the linker when generating pch files

When `llvm-config --cxxflags` outputs -Wl,... options (as has been discussed at
824d9394b529bb1fc521e4a4df8c4e3458ec5641 "Properly handle comma in CLANGFLAGS",
and which end up on the compiler command lines here), Clang failed with an error
"cannot specify -o when generating multiple output files" when generating
sharedvisitor/clang.pch.

Change-Id: I200ebd152f5a524ce7ecdd2f25c34bbaa634f515
Reviewed-on: https://gerrit.libreoffice.org/81065
Tested-by: Jenkins
Reviewed-by: Chris Sherlock <chris.sherlock79@gmail.com>
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

0 files changed, 0 insertions, 0 deletions