anv: get rid of VULKAN_ENTRYPOINT_CPPFLAGS variable
anv: get rid of VULKAN_ENTRYPOINT_CPPFLAGS variable

Add the missing include to AM_CPPFLAGS and use it throughout the
makefile.

Signed-off-by: Emil Velikov <f20878473f414da183da19ee25c8722cc1d711e4@collabora.com>
Acked-by: Jason Ekstrand <68c46a606457643eab92053c1c05574abb26f861@jlekstrand.net>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler