configure.ac/meson.build: Add options for library suffixes

When building the Chrome OS Android container, we need to build copies
of mesa that don't conflict with the Android system-supplied libraries.
This adds options to create suffixed versions of EGL and GLES libraries:

libEGL.so -> libEGL${egl-lib-suffix}.so
libGLESv1_CM.so -> libGLESv1_CM${gles-lib-suffix}.so
libGLESv2.so -> libGLES${gles-lib-suffix}.so

This is similar to what happens when --enable-libglvnd is specified, but
without the side effects of linking against libglvnd.  To avoid
unexpected clashes with the suffixed appended by libglvnd, make it an
error to specify both --enable-libglvnd and --with-egl-lib-suffix.

Reviewed-by: Eric Engestrom <eric.engestrom@intel.com>

src/mapi/es2api/meson.build

@@ -28,7 +28,7 @@ es2_glapi_mapi_tmp_h = custom_target(
 )
 
 libgles2 = shared_library(
-  'GLESv2',
+  'GLESv2' + get_option('gles-lib-suffix'),
   ['../entry.c', es2_glapi_mapi_tmp_h],
   c_args : [
     c_msvc_compat_args, c_vis_args, '-DMAPI_MODE_BRIDGE',