Fix Perl_assert() definition

Source code line numbers now have a typedef and format so that they work
on a variety of platforms.

Author: khwilliamson

perl.h

@@ -5101,8 +5101,8 @@ Gid_t getegid (void);
         ((what)                                                             \
          ? ((void) 0)                                                       \
          : Perl_croak_nocontext("Assertion %s failed:"                      \
-                                " file \"" __FILE__ "\", line %d",          \
-                                STRINGIFY(what),  __LINE__))
+                                " file \"" __FILE__ "\", line %" LINE_Tf,   \
+                                STRINGIFY(what), (line_t) __LINE__))
 #else
 #  define Perl_assert(what)  ((void) 0)
 #endif