Restructure the library layers

src/os/mem/mem_os.h

@@ -0,0 +1,33 @@
+// vim:fileencoding=utf-8:foldmethod=marker
+
+#ifndef MEM_OS_H
+#define MEM_OS_H
+
+#include "../../common/aliases/aliases.h"
+#include "../../common/platform/platform.h"
+
+#include "mem_os_ops.h"
+
+#ifdef WAPP_PLATFORM_CPP
+BEGIN_C_LINKAGE
+#endif // !WAPP_PLATFORM_CPP
+
+#if defined(WAPP_PLATFORM_WINDOWS)
+#include "win/mem_os_win.h"
+#elif defined(WAPP_PLATFORM_POSIX)
+#include "posix/mem_os_posix.h"
+#else
+#error "Unrecognised platform"
+#endif
+
+void *wapp_mem_util_alloc(void *addr, u64 size, MemAccess access, MemAllocFlags flags, MemInitType type);
+void wapp_mem_util_free(void *ptr, u64 size);
+
+wapp_extern void *mem_util_allocate(void *addr, u64 size, MemAccess access, MemAllocFlags flags, MemInitType type);
+wapp_extern void mem_util_free(void *ptr, u64 size);
+
+#ifdef WAPP_PLATFORM_CPP
+END_C_LINKAGE
+#endif // !WAPP_PLATFORM_CPP
+
+#endif // !MEM_OS_H