Add tests for both wcsncasecmp and wcscasecmp

tests/Makefile

@@ -104,6 +104,8 @@ EXPECT_NAMES=\
 	wchar/wcstod \
 	wchar/wcstok \
 	wchar/wcstol \
+	wchar/wcscasecmp \
+	wchar/wcsncasecmp \
 	wctype/towlower \
 	wctype/towupper
 	# TODO: Fix these

tests/expected/wchar/wcscasecmp.stdout

+wcscasecmp(s1, s1) = 0
+wcscasecmp(s1, s2) = -1
+wcscasecmp(s2, s1) = 1
+wcscasecmp(s2, s2) = 0

tests/expected/wchar/wcsncasecmp.stdout

+wcsncasecmp(s1, s1, 17) = 0
+wcsncasecmp(s1, s2, 17) = -1
+wcsncasecmp(s2, s1, 17) = 1
+wcsncasecmp(s2, s1, 15) = 0
+wcsncasecmp(s1, s2, 0) = 0

tests/wchar/wcscasecmp.c

+#include <stdio.h>
+#include <wchar.h>
+
+int main() {
+  wchar_t *s1 = L"ThIs Is StRiNg 1.";
+  wchar_t *s2 = L"tHiS iS sTrInG 2.";
+  printf("wcscasecmp(s1, s1) = %d\n", wcscasecmp(s1, s1));
+  printf("wcscasecmp(s1, s2) = %d\n", wcscasecmp(s1, s2));
+  printf("wcscasecmp(s2, s1) = %d\n", wcscasecmp(s2, s1));
+  printf("wcscasecmp(s2, s2) = %d\n", wcscasecmp(s2, s2));
+}

tests/wchar/wcsncasecmp.c

+#include <stdio.h>
+#include <wchar.h>
+
+int main() {
+  wchar_t *s1 = L"This is string 1.";
+  wchar_t *s2 = L"This is string 2.";
+  printf("wcsncasecmp(s1, s1, 17) = %d\n", wcsncasecmp(s1, s1, 17));
+  printf("wcsncasecmp(s1, s2, 17) = %d\n", wcsncasecmp(s1, s2, 17));
+  printf("wcsncasecmp(s2, s1, 17) = %d\n", wcsncasecmp(s2, s1, 17));
+  printf("wcsncasecmp(s2, s1, 15) = %d\n", wcsncasecmp(s2, s1, 15));
+  printf("wcsncasecmp(s1, s2, 0) = %d\n", wcsncasecmp(s1, s2, 0));
+}