tests: be robust to quote style.

See <http://lists.gnu.org/archive/html/bug-bison/2012-01/msg00120.html>.

	* src/main.c (main): Define the quoting style we use.
	* tests/atlocal.in: Use ASCII style quotes during the tests.
(cherry picked from commit 39ac121457)

tests/atlocal.in

@@ -58,3 +58,7 @@ CONF_JAVA='@CONF_JAVA@'
 
 # We need egrep.
 : ${EGREP='@EGREP@'}
+
+# Use simple quotes (lib/quote.c).
+LC_CTYPE=C
+export LC_CTYPE