android: dri: correctly set HAVE_LIBDRM
android: dri: correctly set HAVE_LIBDRM

Set the macro if we're not building swrast alone.

Cc: Eric Anholt <96f164ad4d9b2b0dacf8ebee2bb1eeb3aa69adf1@anholt.net>
Signed-off-by: Emil Velikov <4c996f2f093ddd0585a556460b4cc3ba555546ef@gmail.com>
Reviewed-by: Chih-Wei Huang <168fbe9b48536378ad61dccedb637b5a226976e8@linux.org.tw>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler