Allow [[:blank:]] to work under locale

This takes advantage of the recently added Configure probe, and if the
platform has an isblank library function, calls that under locale.  This
now matches the documentation

1 files changed, 2 insertions, 2 deletions

diff --git a/regexec.c b/regexec.c
index 81c5f1a64b..76eb7f9bed 100644
--- a/regexec.c
+++ b/regexec.c
@@ -6705,8 +6705,8 @@ S_reginclass(pTHX_ const regexp * const prog, register const regnode * const n,
 		      (ANYOF_CLASS_TEST(n, ANYOF_NXDIGIT) && !isXDIGIT(c))    ||
 		      (ANYOF_CLASS_TEST(n, ANYOF_PSXSPC)  &&  isPSXSPC(c))    ||
 		      (ANYOF_CLASS_TEST(n, ANYOF_NPSXSPC) && !isPSXSPC(c))    ||
-		      (ANYOF_CLASS_TEST(n, ANYOF_BLANK)   &&  isBLANK(c))     ||
-		      (ANYOF_CLASS_TEST(n, ANYOF_NBLANK)  && !isBLANK(c))
+		      (ANYOF_CLASS_TEST(n, ANYOF_BLANK)   &&  isBLANK_LC(c))  ||
+		      (ANYOF_CLASS_TEST(n, ANYOF_NBLANK)  && !isBLANK_LC(c))
 		     ) /* How's that for a conditional? */
 	    ) {
 		match = TRUE;