windows: Move the compatibility header to the compat subfolder

src/libstrongswan/Makefile.am

@@ -101,8 +101,8 @@ utils/utils.h utils/chunk.h utils/debug.h utils/enum.h utils/identification.h \
 utils/lexparser.h utils/optionsfrom.h utils/capabilities.h utils/backtrace.h \
 utils/leak_detective.h utils/printf_hook/printf_hook.h \
 utils/printf_hook/printf_hook_vstr.h utils/printf_hook/printf_hook_builtin.h \
-utils/parser_helper.h utils/test.h utils/integrity_checker.h utils/windows.h \
-utils/process.h utils/utils/strerror.h utils/compat/apple.h
+utils/parser_helper.h utils/test.h utils/integrity_checker.h utils/process.h \
+utils/utils/strerror.h utils/compat/windows.h utils/compat/apple.h
 endif
 
 library.lo :	$(top_builddir)/config.status
@@ -133,7 +133,7 @@ if USE_WINDOWS
     threading/windows/rwlock.c \
     threading/windows/spinlock.c \
     threading/windows/semaphore.c \
-    utils/windows.c
+    utils/compat/windows.c
 else
   libstrongswan_la_LIBADD += $(PTHREADLIB)
 endif