Bump (Linux) Clang baseline to 5.0.2

...as discussed at
<https://lists.freedesktop.org/archives/libreoffice/2018-November/081435.html>
"minutes of ESC call ...".

This no longer sets CLANGVER, CLANG_VERSION, and CLANG_FULL_VERSION when using
Apple Clang (on macOS), which uses different version numbers from upstream
anyway.  But those variables are only used in the context of compiler plugins,
which do not work with Apple Clang anyway (which lacks necessary include files).

(Also, move "AC_SUBST(COM_IS_CLANG)" up to where it belongs.)

Change-Id: Iee37c42ecacf52fa5a07e35241bcd404025e1cdf
Reviewed-on: https://gerrit.libreoffice.org/63899
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

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