dos2unix: fix upstream version check

(From OE-Core rev: dabce3f4f9db7d57348eeb8608323687cff91e82)

Signed-off-by: Alexander Kanavin <alex.kanavin@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-support/dos2unix/dos2unix_7.4.0.bb

@@ -9,6 +9,7 @@ LICENSE = "BSD-2-Clause"
 LIC_FILES_CHKSUM = "file://COPYING.txt;md5=1b78fca784db24f4a40e30b300787f3f"
 
 SRC_URI = "git://git.code.sf.net/p/dos2unix/dos2unix"
+UPSTREAM_CHECK_GITTAGREGEX = "dos2unix-(?P<pver>(\d+(\.\d+)+))"
 
 # Release 7.4.0
 SRCREV = "1182533bde3c1fe65be2ead465e87671faa2c027"