* libc/include/sys/errno.h: Add ECASECLASH to indicate case clash

on case insensitve file systems.

newlib/libc/include/sys/errno.h

@@ -138,6 +138,7 @@ extern __IMPORT int _sys_nerr;
 #define ENOTSUP 134		/* Not supported */
 #define ENOMEDIUM 135   /* No medium (in tape drive) */
 #define ENOSHARE 136    /* No such host or network path */
+#define ECASECLASH 137  /* Filename exists with different case */
 
 /* From cygwin32.  */
 #define EWOULDBLOCK EAGAIN	/* Operation would block */