Android: remove dependence on .SECONDEXPANSION
Android: remove dependence on .SECONDEXPANSION

With the Android build system changes to ninja/kati, the use of
.SECONDEXPANSION is no longer supported. Fix this by avoiding rule specific
variables and using $(transform-generated-source).

Cc: "11.1 11.2" <59f39c0db42d4479a46b02d4d2bc11120e37bb44@lists.freedesktop.org>
Signed-off-by: Rob Herring <fbb37eacae100e13076d5c4b46f06cfa4d6fa9f8@kernel.org>
Reviewed-by: Emil Velikov <f20878473f414da183da19ee25c8722cc1d711e4@collabora.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler