bugfix: help pacman detect new upstream pidcat

this is a correction to the final bullet in commit message
9b032852f8b8b62 - I was confused there. Some more manual testing
clarified what was going on. Indeed the function _has_ to be hand
defined else versioning doesn't bump up correctly.

Tested this manually with:
  ```sh
  $ makepkg
  $ pacman  -Qip $path_to_pkg_tar_zst
  # see output shows a useful version bump now , eg:
  Version         : 2.1.0.r14.0cb1c2c-1
  ```

1 files changed, 7 insertions, 1 deletions

diff --git a/PKGBUILD b/PKGBUILD
index fe8d67d75dd4..0591898a2850 100644
--- a/PKGBUILD
+++ b/PKGBUILD
@@ -1,7 +1,7 @@
 # Maintainer: Jonathan Zacsh <j@zac.sh>
 
 pkgname=pidcat-git
-pkgver=2.1.0
+pkgver=2.1.0.r14.0cb1c2c
 pkgrel=1
 pkgdesc="Pidcat is a colored logcat script with improved readability that only shows log entries for a specific Android package."
 arch=('any')
@@ -23,3 +23,9 @@ package() {
   # Install run script
   install -Dm755 "$srcdir"/pidcat/pidcat.py "$pkgdir"/usr/bin/pidcat
 }
+
+pkgver() {
+  # per https://gitlab.archlinux.org/pacman/pacman/blob/edce7555a6b7410d1a4da6d27d22383989306ccc/proto/PKGBUILD-vcs.proto#L46
+  cd "$srcdir/${pkgname%-git}"
+  git describe --long | sed 's/\([^-]*-\)g/r\1/;s/-/./g'
+}