Allows for using `make clean` to remove any output files generated by
make(1).

Signed-off-by: Lukas Fleischer <archlinux@cryptocrack.de>

This build system overhaul allows for adding (define-style) macros to
our scripts. All source files are now suffixed with ".in" to clarify
that they might contain unprocessed defines. The Makefile provides a new
rule to preprocess source files and generate proper output scripts.

Also, add a "@pkgdatadir@" define (as used in GNU Autotools) and use it
instead of hardcoded paths to "/usr/share/devtools" everywhere. We
missed this when adding PREFIX support to the build system in commit
35fc83ce

.

Signed-off-by: Lukas Fleischer <archlinux@cryptocrack.de>

Signed-off-by: Lukas Fleischer <archlinux@cryptocrack.de>
Signed-off-by: Pierre Schmitz <pierre@archlinux.de>

Default to "/usr/local" which should be used if you want to build
devtools from sources and install without using a package manager.

Use `make PREFIX=/usr install` to install to "/usr" instead.

Signed-off-by: Lukas Fleischer <archlinux@cryptocrack.de>
Signed-off-by: Pierre Schmitz <pierre@archlinux.de>

Signed-off-by: Florian Pritz <bluewind@xinu.at>

 delete mode 100755 communityco
Signed-off-by: Pierre Schmitz <pierre@archlinux.de>

Signed-off-by: Eric Bélanger <snowmaniscool@gmail.com>
Signed-off-by: Pierre Schmitz <pierre@archlinux.de>

Signed-off-by: Lukas Fleischer <archlinux@cryptocrack.de>

Signed-off-by: Lukas Fleischer <archlinux@cryptocrack.de>

This will create chroots on demand if needed.