gallium/nouveau: fully build the driver under android
gallium/nouveau: fully build the driver under android

Fix the trivial typo in the variable name.

Cc: "10.2 10.3" <59f39c0db42d4479a46b02d4d2bc11120e37bb44@lists.freedesktop.org>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler