relocatable-prog-wrapper: Fix breakage on Cygwin.

* modules/relocatable-prog-wrapper (Files): Add lib/stat.c, lib/lstat.c.
(Depends-on): Remove intprops.
* lib/relocwrapper.c: Update dependency tree.
(strerror): Undefine.
* build-aux/install-reloc (func_create_wrapper): Do not compile
strerror.c and strerror-override.c. Erase stat.o and lstat.o.

modules/relocatable-prog-wrapper

@@ -15,9 +15,11 @@ lib/careadlinkat.c
 lib/allocator.h
 lib/allocator.c
 lib/readlink.c
+lib/stat.c
 lib/canonicalize-lgpl.c
 lib/malloca.h
 lib/malloca.c
+lib/lstat.c
 lib/relocatable.h
 lib/relocatable.c
 lib/setenv.c
@@ -43,7 +45,6 @@ stdint
 stdlib
 unistd
 environ
-intprops
 string
 verify