Cygwin: Drop pointless loadlib.h includes in utilities

These utilities used to LoadLibrary()/GetProcAddress(), but don't
anymore.

winsup/utils/cygpath.cc

@@ -29,7 +29,6 @@ details. */
 #include <ntdll.h>
 
 #include "wide_path.h"
-#include "loadlib.h"
 
 static char *prog_name;
 static char *file_arg, *output_arg;

winsup/utils/module_info.cc

@@ -12,7 +12,6 @@ details. */
 #include <windows.h>
 #define PSAPI_VERSION 1
 #include <psapi.h>
-#include "loadlib.h"
 
 /* Returns full name of Dll, which is loaded by hProcess at BaseAddress.
    Uses psapi.dll. */

winsup/utils/path.cc

@@ -28,7 +28,6 @@ details. */
 #ifdef FSTAB_ONLY
 #include <sys/cygwin.h>
 #endif
-#include "loadlib.h"
 
 #ifndef FSTAB_ONLY
 /* Used when treating / and \ as equivalent. */

winsup/utils/ps.cc

@@ -21,7 +21,6 @@ details. */
 #include <cygwin/version.h>
 #include <ntdef.h>
 #include <ntdll.h>
-#include "loadlib.h"
 
 /* Maximum possible path length under NT.  There's no official define
    for that value.  Note that PATH_MAX is only 4K. */