Git: Use an enum for simple/amend commit

Change-Id: Ibea0a1f2826c67796a56414326fe6afdee654576
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>

src/plugins/git/gitsettings.h

@@ -35,6 +35,12 @@
 namespace Git {
 namespace Internal {
 
+enum CommitType
+{
+    SimpleCommit,
+    AmendCommit
+};
+
 // Todo: Add user name and password?
 class GitSettings : public VcsBase::VcsBaseClientSettings
 {