patch 8.2.1738: Mac: str2float() recognizes comma instead of decimal point

Problem:    Mac: str2float() recognizes comma instead of decimal point.
Solution:   Set LC_NUMERIC to "C". (closes #7003)

src/os_mac_conv.c

@@ -579,6 +579,10 @@ mac_lang_init(void)
 	    vim_setenv((char_u *)"LANG", (char_u *)buf);
 #   ifdef HAVE_LOCALE_H
 	    setlocale(LC_ALL, "");
+#   endif
+#   if defined(FEAT_FLOAT) && defined(LC_NUMERIC)
+	    // Make sure strtod() uses a decimal point, not a comma.
+	    setlocale(LC_NUMERIC, "C");
 #   endif
 	}
     }

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1738,
 /**/
     1737,
 /**/