Fix build failure due to libc functions used in old glibc and libc++ headers

glibc < 2.26 uses calloc and malloc for the str(n)dup macros in
bits/string2.h, included by string.h

libc++ cstdlib header can also use ::malloc, ::realloc, ::calloc and ::free

Fixes: 159851d ("Wrap memory allocation functions to abort on failure")
Fixes: d77bc02 ("Fix build failure due to libc++ using libc functions")
(cherry picked from commit 1be72c9)

Author: blino

src/loader.c

@@ -26,11 +26,12 @@
 
 #include "loader-private.h"
 
-#include "alloc-private.h"
 #include <dlfcn.h>
 #include <stdio.h>
 #include <string.h>
 
+#include "alloc-private.h"
+
 static void* s_impl_library = 0;
 static struct wpe_loader_interface* s_impl_loader = 0;
 

src/pasteboard-generic.cpp

@@ -28,12 +28,12 @@
 
 #include <map>
 #include <string>
+#include <cstring>
 
 // We need to include this header last, in order to avoid template expansions
 // from the C++ standard library happening after it forbids usage of the libc
 // memory functions.
 #include "alloc-private.h"
-#include <cstring>
 
 namespace Generic {
 using Pasteboard = std::map<std::string, std::string>;

src/pasteboard.c

@@ -26,11 +26,12 @@
 
 #include "pasteboard-private.h"
 
-#include "alloc-private.h"
 #include "loader-private.h"
 #include <stdlib.h>
 #include <string.h>
 
+#include "alloc-private.h"
+
 void
 wpe_pasteboard_string_initialize(struct wpe_pasteboard_string* string, const char* in_string, uint64_t in_length)
 {