external/libcmis: Falling back to C++03 is too drastic

e.g. when compiling against system libxml2, which in turn includes system
ICU include files, which may use C++11 chart16_t.  So assume that -std=gnu++14
is acceptable for any GCC version for which at least on of -std=gnu++17,
-std=gnu++1z, -std=c++17, -std=c++1z is acceptable, and just fall back to C++14.

Change-Id: Id9f07ab4f419e5683f4fb9c9b2d3bdda251cdd1b
Reviewed-on: https://gerrit.libreoffice.org/45409
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

0 files changed, 0 insertions, 0 deletions