app-admin/entr: add 5.3

- Unit tests were replaced with system tests in commit [1]. They require
  vim, tmux, git and file which are set as BDEEPEND under test USE flag.
- The `which` command used in test script was replaced by `command -pv`
  with a patch taken from upstream [2].
- PREFIX is set by exporting PREFIX variable rather than sed patching
  Makefile
- CC is newly exported with tc-export function in configuration phase
  which allows us to use default src_compile function
- Tests seem to work best if SHELL is set to /bin/bash which is also
  exported in configuration phase in order to avoid local src_test
  function just for exporting one variable.

[1] https://github.com/eradman/entr/commit/944eb59d31dd26894b8822f8b711b1dbfdc67049
[2] https://github.com/eradman/entr/pull/108

Signed-off-by: Petr Vaněk <arkamar@atlas.cz>
Signed-off-by: Sam James <sam@gentoo.org>

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