Git: Require 1.7.2

Remove legacy code

Change-Id: I0ce03f7a34c92b48ceb705a0feec43e0ba89ef5c
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@digia.com>

src/plugins/git/gitutils.h

@@ -61,6 +61,8 @@ inline unsigned version(unsigned major, unsigned minor, unsigned patch)
     return (major << 16) + (minor << 8) + patch;
 }
 
+QString versionString(unsigned ver);
+
 } // namespace Internal
 } // namespace Git