Allow build systems without standard cc to successfully run the
dependency checking helper scripts from the Makefile.
This supports custom compilers specified by the common CC environment
variable, preprocessors given as CPP and additional preprocessor flags
from CPPFLAGS.
Additional flags from CFLAGS and LDFLAGS are considered for compiling/linking.
Overall, this facilitates cross-compilation and similar setups.
Signed-off-by: Marcel Bargull <marcel.bargull@udo.edu>
It's not possible to run any of the scripts on distributions which do
have `bash` not in `/bin`. This is being fixed by using `/usr/bin/env
bash` instead.
Signed-off-by: Sascha Grunert <sgrunert@suse.com>
