[Bug 284893] Fix ccache when ports has USES=llvm and USES=cmake

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=284893

            Bug ID: 284893
           Summary: Fix ccache when ports has USES=llvm and USES=cmake
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Ports Framework
          Assignee: portmgr@FreeBSD.org
          Reporter: yuri@freebsd.org
                CC: ports-bugs@FreeBSD.org

Created attachment 257644
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=257644&action=edit
patch

Currently ccache doesn't work when USES contains both llvm and cmake.

The reason that ccache works without USES=llvm is that CXX=c++ in such case and
bsd.ccache.mk adds the directory with ccache-provided c++ into PATH.

USES=llvm causes CXX to have the full path to the compiler executable, and the
PATH method doesn't work.

The attached patch adds ccache to cmake launchers when USES=llvm which fixes
ccache in these cases.

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