Use gitarchive-version for spec file

Signed-off-by: Jan Friesse <jfriesse@redhat.com>

Makefile.am

@@ -63,7 +63,7 @@ $(SPEC): $(SPEC).in .version config.status
 		alphatag="" && \
 		dirty="" && \
 		numcomm="0"; \
-	else \
+	elif [ "`git log -1 --pretty=format:x . 2>&1`" = "x" ]; then \
 		gitver="`GIT_DIR=$(abs_srcdir)/.git git describe --abbrev=4 --match='v*' HEAD 2>/dev/null`" && \
 		rpmver=`echo $$gitver | sed -e "s/^v//" -e "s/-.*//g"` && \
 		alphatag=`echo $$gitver | sed -e "s/.*-//" -e "s/^g//"` && \
@@ -72,6 +72,12 @@ $(SPEC): $(SPEC).in .version config.status
 		cd $(abs_srcdir) && \
 		git update-index --refresh > /dev/null 2>&1 || true && \
 		dirty=`git diff-index --name-only HEAD 2>/dev/null` && cd - 2>/dev/null; \
+	else \
+		gitver="`cd $(abs_srcdir); build-aux/git-version-gen .tarball-version .gitarchivever`" && \
+		rpmver=$$gitver && \
+		alphatag="" && \
+		dirty="" && \
+		numcomm="0"; \
 	fi && \
 	if [ -n "$$dirty" ]; then dirty="dirty"; else dirty=""; fi && \
 	if [ "$$numcomm" = "0" ]; then \