[proxy](7/n) self vendor array and algorithm headers (#722)

* [proxy](7/n) proxy array and algorithm headers

* [wip] address CRs

* undo comment

* format

* fix build

* simplify macro dispatching

src/test/func/memcpy/func-memcpy.cc

@@ -30,6 +30,7 @@ int main()
 
 #  include <assert.h>
 #  include <csetjmp>
+#  include <initializer_list>
 #  include <stdio.h>
 #  include <stdlib.h>
 #  include <string.h>

src/test/func/memory/memory.cc

@@ -1,3 +1,4 @@
+#include <array>
 #include <iostream>
 #include <snmalloc/snmalloc.h>
 #include <test/opt.h>
@@ -5,6 +6,7 @@
 #include <test/xoroshiro.h>
 #include <unordered_set>
 #include <vector>
+
 #if ((defined(__linux__) && !defined(__ANDROID__)) || defined(__sun)) || \
   defined(__OpenBSD__) && !defined(SNMALLOC_QEMU_WORKAROUND)
 /*

src/test/func/thread_alloc_external/thread_alloc_external.cc

@@ -2,6 +2,7 @@
 #  undef SNMALLOC_USE_PTHREAD_DESTRUCTORS
 #endif
 
+#include <new>
 #include <snmalloc/snmalloc_core.h>
 #include <test/setup.h>