Fix version.sh to not overwrite ${project.version}

Change-Id: If5ae792581170bcba2dc1860012cbe389d8e9f24
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

tools/version.sh

@@ -133,7 +133,14 @@ perl -pi~ -e '
 	' org.eclipse.jgit.packaging/org.*.feature/feature.xml
 
 perl -pi~ -e '
-	s{<(version)>.*</\1>}{<${1}>'"$POM_V"'</${1}>};
+	if ($ARGV ne $old_argv) {
+		$seen_version = 0;
+		$old_argv = $ARGV;
+	}
+	if (!$seen_version) {
+		$seen_version = 1 if
+		s{<(version)>.*</\1>}{<${1}>'"$POM_V"'</${1}>};
+	}
 	' org.eclipse.jgit.packaging/org.*.feature/pom.xml
 
 perl -pi~ -e '
@@ -152,8 +159,8 @@ perl -pi~ -e '
 		$seen_version = 0;
 		$old_argv = $ARGV;
 	}
-	if ($seen_version < 2) {
-		$seen_version++ if
+	if (!$seen_version) {
+		$seen_version = 1 if
 		s{<(version)>.*</\1>}{<${1}>'"$POM_V"'</${1}>};
 	}
 	' org.eclipse.jgit.packaging/pom.xml