Remove unused variables in mbedtls_md5_context + remove unnecessary ifdef __cplusplus

Author: adustm

features/mbedtls/targets/TARGET_STM/md5_alt.h

@@ -38,9 +38,6 @@ extern "C" {
  */
 typedef struct
 {
-    uint32_t total[2];          /*!< number of bytes processed  */
-    uint32_t state[4];          /*!< intermediate digest state  */
-    unsigned char buffer[64];   /*!< data block being processed */
     HASH_HandleTypeDef hhash_md5;
 }
 mbedtls_md5_context;
@@ -99,14 +96,6 @@ void mbedtls_md5_process( mbedtls_md5_context *ctx, const unsigned char data[64]
 }
 #endif
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#ifdef __cplusplus
-}
-#endif
-
 #endif /* MBEDTLS_MD5_ALT */
 
 #endif /* md5_alt.h */