windres-wrapper: Do the format name comparisons case insensitively

wrappers/native-wrapper.h

@@ -23,6 +23,7 @@
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
+#include <ctype.h>
 
 #ifdef _WIN32
 #define WIN32_LEAN_AND_MEAN
@@ -94,6 +95,14 @@ static inline int _tspawnvp_escape(int mode, const TCHAR *filename, const TCHAR
     escaped_argv[num_args] = NULL;
     return _tspawnvp(mode, filename, escaped_argv);
 }
+#else
+static inline int _tcsicmp(const TCHAR *a, const TCHAR *b) {
+    while (*a && tolower(*a) == tolower(*b)) {
+        a++;
+        b++;
+    }
+    return *a - *b;
+}
 #endif
 
 static inline TCHAR *concat(const TCHAR *prefix, const TCHAR *suffix) {