PKGBUILD-git improvements

- Remove two configure flags which just caused warnings.
- Replace `pkgver` function with a working one.
- Explicititly `cd` into `srcdir` before `gitname` as found in
  `PKGBUILD-git.proto`.
- Bump `pkgrel`.
- Specify correct package version.
Allow the user to override SYMLINK_DIRS in lsrc(1)

This adds a `-s` that can be used to override the `SYMLINK_DIRS` config,
or the `-S` flag, to lsrc(1).
A test for mkrc -s

The -s flag already worked in mkrc, so add a test for it.
Attempt to fix mkrc(1) -s

mkrc(1)'s `-s` flag depends on rcup(1) accepting the `-s` flag. Pass it
through, similarly to `-S`.

However, rcup(1) does not yet accept `-s`, so this breaks everything.
rcup(1) takes -s
Passing mkrc(1) tests

Default `force_symlink` to a sentinal that we don't check for.

Fix the test: it moves the directory, then symlinks the files.
rcdn(1) supports -s
Documentation for lsrc(1), rcdn(1), rcup(1) -s
Remove unused argument to show_file()
Cleanup from PR

- Quotes around `$file`.
- Typo in manpage.