STR_REALLOC definition in 5.6+

For now:

#define STR_REALLOC(ptr, size)
ptr = (char *) erealloc(ptr, size);

Dealing with https://github.com/phalcon/cphalcon/pull/2772

I switch from realloc to str_realloc.
But this is not portable (str_realloc is 5.6+ only)

STR_REALLOC should be better, as portable, 5.0+

But should be defined as str_erealloc

What do you think ?

Probably too late, as if we fix this definition, it will portable in all
versions > 5.0 except 5.6.0 :(

Given that interned strings have been added in PHP 5.4 and STR_REALLOC has
been defined like that for all the existing 5.4 and 5.5 releases, you'd
have to do a version check in any case. So I don't see much point in this...

Nikita