t0091: allow test in a repository without tags

The beginning of the [System Info] section, which should match the
"git version --build-options" output, may not identify our version
as "git version 2.whatever".  When built in a repository cloned
without tags, for example, "git version unknown.g00000000" can be a
legit version string.

Signed-off-by: Junio C Hamano <[email protected]>

Author: gitster

t/t0091-bugreport.sh

@@ -39,9 +39,9 @@ test_expect_success 'sanity check "System Info" section' '
 
 	sed -ne "/^\[System Info\]$/,/^$/p" <git-bugreport-format.txt >system &&
 
-	# The beginning should match "git version --build-info" verbatim,
+	# The beginning should match "git version --build-options" verbatim,
 	# but rather than checking bit-for-bit equality, just test some basics.
-	grep "git version [0-9]." system &&
+	grep "git version " system &&
 	grep "shell-path: ." system &&
 
 	# After the version, there should be some more info.