Fix a typo in Makefile.am

colorscheme.h => color_scheme.h
Keep compilation information up to date

Previous version didn't recompile version.c file on each compilation.
This change should fix this.
Merge branch 'keep-compilation-info-up-to-date'

Recompile version.c file, which contains part of compilation info, when
any file if recompiled or whole application is relinked.