Added configure check for str[n]casecmp.

diff --git a/configure.in b/configure.in
index d61acfb..287cff5 100644
--- a/configure.in
+++ b/configure.in
@@ -487,8 +487,9 @@
 	rfork \
 	sendmsg \
 	sigaltstack \
+	strcasecmp \
 	strerror \
-	stricmp \
+	strncasecmp \
 	tcgetattr \
 	timegm \
 	usleep \