Add <locale.h> header.

The definitions here are aligned with the new implementation of the <locale.h> functions in ORCALib.

ORCACDefs/locale.h

@@ -0,0 +1,54 @@
+/****************************************************************
+*
+*  locale.h - locales
+*
+*  September 2021
+*  Stephen Heumann
+*
+****************************************************************/
+
+#ifndef __locale__
+#define __locale__
+
+struct lconv {
+   char *decimal_point;
+   char *thousands_sep;
+   char *grouping;
+   char *mon_decimal_point;
+   char *mon_thousands_sep;
+   char *mon_grouping;
+   char *positive_sign;
+   char *negative_sign;
+   char *currency_symbol;
+   char frac_digits;
+   char p_cs_precedes;
+   char n_cs_precedes;
+   char p_sep_by_space;
+   char n_sep_by_space;
+   char p_sign_posn;
+   char n_sign_posn;
+   char *int_curr_symbol;
+   char int_frac_digits;
+   char int_p_cs_precedes;
+   char int_n_cs_precedes;
+   char int_p_sep_by_space;
+   char int_n_sep_by_space;
+   char int_p_sign_posn;
+   char int_n_sign_posn;
+   };
+
+#ifndef NULL
+#define NULL  (void *) 0L
+#endif
+
+#define LC_ALL          0
+#define LC_COLLATE      1
+#define LC_CTYPE        2
+#define LC_MONETARY     3
+#define LC_NUMERIC      4
+#define LC_TIME         5
+
+struct lconv   *localeconv(void);
+char           *setlocale(int, const char *);
+
+#endif