The git-version-gen script is not included in tarball releases,
so we need to avoid attempts to call it when running autoreconf.

Upstream-Status: Inappropriate [configuration]

Signed-off-by: Andre McCurdy <armccurdy@gmail.com>

diff --git a/configure.ac b/configure.ac
index 7004bd3..b2b03c6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -31,7 +31,7 @@
 
 AC_PREREQ(2.57)
 AC_INIT([strace],
-	m4_esyscmd([./git-version-gen .tarball-version]),
+	m4_esyscmd_s([cat .tarball-version]),
 	[strace-devel@lists.sourceforge.net],
 	[strace],
 	[https://strace.io])
