Fix a compilier error with msys2-mingw64 ( ld.exe: cannot find -ldl ) (#35)

davidwed

2019-09-07 f6437cfaed1dd0acd1ec63e1c282d0e7edfa4522

 src/library/os/os.h

@@ -17,15 +17,15 @@
#include <string.h>
#include <ctype.h>
#include <sys/types.h>
#include <unistd.h>
//definition of size_t
#include <stdlib.h>
#ifdef __unix__
#include <unistd.h>
#include <stdbool.h>
#endif

typedef enum {
   NONE, VMWARE
   NONE, CONTAINER, VM
} VIRTUALIZATION;

typedef enum {