build: replace genshader by binary linker

build: replace genshader by binary linker

Instead of generating C source files, we now use our binary-linker make
target which can link in any arbitrary binary file.

This way, we can delete genshader and instead link the files directly.
This speeds up compilation and makes the code more consistent.
We also strip the shaders from useless comments and whitespaces to reduce
memory consumption.

Signed-off-by: David Herrmann <dh.herrmann@gmail.com>