proj2make: some minor improvements.

- Enable use of `find_directory()` when searching for "etc/makefile".
- Fixed a missing return statement on `_l::str()`;
- Fix "STATIC" typo on gAppTypes.
- Remov

proj2make: some minor improvements.

- Enable use of `find_directory()` when searching for "etc/makefile".
- Fixed a missing return statement on `_l::str()`;
- Fix "STATIC" typo on gAppTypes.
- Removed some superfluous spaces on the output makefile, added a couple
of missing ones.
- Avoid adding library paths as include dirs.
- Replace BeOS header paths with Haiku's.
- Some minor code style changes, here and there.

Change-Id: I03f221c39e894fb6ab6ffebd95ffe5e749678540
Reviewed-on: https://review.haiku-os.org/c/haiku/+/7786
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: Jérôme Duval <jerome.duval@gmail.com>
Reviewed-by: Adrien Destugues <pulkomandy@pulkomandy.tk>

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