Windows compat: use string.h, not strings.h

Inlines the function strcasecmp from strings.h, which is
not present on Windows.

This should close Issue GregBowyer#12 and PR GregBowyer#15.

bindings/encodings.cc

@@ -13,7 +13,9 @@
 //
 
 #include <stdio.h>
-#include <strings.h>
+#include <string.h> // Windows compat (vs. strings.h)
+#include <ctype.h>
+
 #include "compact_lang_det.h"
 #include "encodings.h"
 
@@ -100,6 +102,19 @@ extern const cld_encoding cld_encoding_info[] = {
   {"SOFTBANK_ISO_2022_JP", CLD2::SOFTBANK_ISO_2022_JP},
 };
 
+// Re-written from strings.h
+inline int strcasecmp(const char *s1, const char *s2)
+{
+   for (;;) {
+       int c1 = tolower( *((unsigned char *) s1++));
+       int c2 = tolower( *((unsigned char *) s2++));
+       if ((c1 != c2) || (c1 == '\0')) {
+           return c1 - c2;
+       }
+   }
+   return 0;
+}
+
 CLD2::Encoding EncodingFromName(const char *name) {
   for(int i=0;i<CLD2::NUM_ENCODINGS;i++) {
     if (!strcasecmp(cld_encoding_info[i].name, name)) {