meson: move cc and cpp definitions to top of main meson.build

This just makes using cc and cpp easier.

v2: - Add this patch to fix altivec

Signed-off-by: Dylan Baker <dylan.c.baker@intel.com>
Reviewed-by: Eric Engestrom <eric.engestrom@intel.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
1 file changed