Merge pull request 'Removed memcpy and <cstring>' (#3) from feature/no_cstring into master

Reviewed-on: http://git.mercurial-manifold.eu/an.tsouchlos/const_fmt/pulls/3

const_fmt/format.h

@@ -2,8 +2,6 @@
 #define LOGGER_FORMAT_H
 
 
-#include <cstring>
-
 #include "format_impl.h"
 #include "parse.h"
 #include "utility.h"

const_fmt/format_impl.h

@@ -96,10 +96,6 @@ constexpr inline const char* digits2_base(size_t value) {
 
 
 constexpr inline void copy2(char* dst, const char* src) {
-    if (!std::is_constant_evaluated()) {
-        std::memcpy(dst, src, 2);
-        return;
-    }
     *dst++ = static_cast<char>(*src++);
     *dst   = static_cast<char>(*src);
 }