remove __cplusplus stuff from tommath_private.h

tommath_private.h is an internal header which won't be included
by a C++ source file.

Author: minad

tommath_private.h

@@ -6,10 +6,6 @@
 
 #include "tommath.h"
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 /* Hardening libtommath
  * --------------------
  *
@@ -222,8 +218,4 @@ MP_DEPRECATED(s_mp_toom_mul) mp_err mp_toom_mul(const mp_int *a, const mp_int *b
 MP_DEPRECATED(s_mp_toom_sqr) mp_err mp_toom_sqr(const mp_int *a, mp_int *b);
 MP_DEPRECATED(s_mp_reverse) void bn_reverse(unsigned char *s, int len);
 
-#ifdef __cplusplus
-}
-#endif
-
 #endif