w32: Prepare for the case gcrypt.h will not include winsock2.h.
* common/dynload.h: Include specific headers only. * common/exechelp-w32.c: Include <windows.h>. * common/gettime.c: Likewise. * common/utf8conv.c: Likewise. * tests/gpgscm/ffi.c: Likewise. * tools/gpgconf.c: Likewise. * configure.ac: Check winsock2.h, removing gl_HEADER_SYS_SOCKET.
- GnuPG-bug-id: T5731
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>