added ECP_SUPPORT in opt.h (disabled by default); renamed MD5_SUPPORT to PPP_MD5_RANDM, which is more meaningful

src/netif/ppp/magic.c

@@ -80,7 +80,7 @@
 #include "polarssl/md5.h"
 #include "magic.h"
 
-#if MD5_SUPPORT /* Using MD5 for better randomness if MD5 support is enabled */
+#if PPP_MD5_RANDM /* Using MD5 for better randomness if enabled */
 
 #define MAGIC_RANDPOOLSIZE 16   /* Bytes stored in the pool of randomness. */
 
@@ -187,7 +187,7 @@ u32_t magic() {
   return new_rand;
 }
 
-#else /* MD5_SUPPORT */
+#else /* PPP_MD5_RANDM */
 
 /*****************************/
 /*** LOCAL DATA STRUCTURES ***/
@@ -258,6 +258,6 @@ u32_t magic() {
   return ((((u32_t)rand() << 16) + rand()) + magic_randomseed);
 }
 
-#endif /* MD5_SUPPORT */
+#endif /* PPP_MD5_RANDM */
 
 #endif /* PPP_SUPPORT */

src/netif/ppp/magic.h

@@ -100,7 +100,7 @@ void magic_randomize(void);
  */
 u32_t magic(void);	/* Returns the next magic number */
 
-#if MD5_SUPPORT
+#if PPP_MD5_RANDM
 /*
  * Fill buffer with random bytes
  *
@@ -112,7 +112,7 @@ u32_t magic(void);	/* Returns the next magic number */
  * the first use.
  */
 void random_bytes(unsigned char *buf, u32_t len);
-#endif /* MD5_SUPPORT */
+#endif /* PPP_MD5_RANDM */
 
 #endif /* PPP_SUPPORT */
 #endif /* MAGIC_H */