gallium/osmesa: link against static libglapi library too to get the gl exports
gallium/osmesa: link against static libglapi library too to get the gl exports

This should fix missing symbols in a osmesa built against shared glapi
osmesa build. All opengl exports were missing that are defined in the
static glapi, so link against both to fix this.

I could swear I've done this before, maybe there was a glitch in the matrix.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=47824
Cc: "9.2" <59f39c0db42d4479a46b02d4d2bc11120e37bb44@lists.freedesktop.org>
Signed-off-by: Maarten Lankhorst <743c2818a341d71b99ed2b566f9f80c2fc288f93@canonical.com>

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