add soname provide

PKGBUILD

@@ -3,13 +3,14 @@
 pkgname=gpm
 pkgver=1.20.7.r38.ge82d1a6
 _commit='e82d1a653ca94aa4ed12441424da6ce780b1e530'
-pkgrel=1
+pkgrel=2
 pkgdesc='A mouse server for the console and xterm'
 arch=('x86_64')
 url='https://www.nico.schottelius.org/software/gpm/'
 license=('GPL')
 depends=('bash' 'procps-ng')
 makedepends=('git')
+provides=('libgpm.so')
 options=('!makeflags')
 source=("git+https://github.com/telmich/gpm.git#commit=${_commit}"
         'gpm.sh'