Add initial support for building AOO with Clang on Linux.

This allows Ubuntu 16.04 to compile AOO with Clang 1.8 on an x86.

Other architectures probably don't work, as Clang 1.8 is

Add initial support for building AOO with Clang on Linux.

This allows Ubuntu 16.04 to compile AOO with Clang 1.8 on an x86.

Other architectures probably don't work, as Clang 1.8 is pretty
strict about the low-level C++ ABI hacks in main/bridges, but at
least they should fail early in main/bridges instead of the
previous behaviour, where main/bridges compiles nothing when
"$(COM)" != "GCC" and main/i18npool then fails with a mysterious
"error: cannot get uno environments" message.

Patch by: me



git-svn-id: https://svn.apache.org/repos/asf/openoffice/trunk@1782030 13f79535-47bb-0310-9956-ffa450edef68

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