test: Add a test case for the 2 bugs added by FindBin removal.
This is the barest "does kdesrc-build --version even work" test, done 3
ways over:
- Direct call to the kdesrc-build script
- Symlinked "kdesrc-build" pointing to kdesrc-build script run from a
directory in PATH
- Call to installed version of kdesrc-build (installing to a temp dir)
Note: Anyone can run the test suite with Perl's Test::Harness module set
installed, using the command "prove -I modules" from the kdesrc-build
source dir. "prove" may have different names on some distros to allow
for multiple versions.