etnaviv: remove not needed forward declarations
etnaviv: remove not needed forward declarations

Signed-off-by: Christian Gmeiner <7d98dcb0e8545320ffc03d45630c91ed21ec4c41@gmail.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler