curl: upgrade to version 7.33.0

- from curl-7.26.0.patch:
  * drop ADDCFLAGS stuff, must be some dmake relic
  * drop wspiapi.h, presumably for backward compat with NT 5.0/Win2000
    which is unsupported (and ws2_32.lib is linked anyway...)
  * split out curl-freebsd.patch.1
- curl-7.26.0_win.patch:
  * drop the library renaming stuff - can be handled in Package and
    RepositoryExternal.mk without patch
  * rename the rest to curl-msvc.patch.1
- drop curl-aix.patch:
  presumably don't need special check for V7BETA since it's released now
- drop curl-7.26.0_strlcat.patch (obsolete)

Change-Id: Ie8c1d9e72f82ada95f42c49d22d90e43b1a6c3c0
Reviewed-on: https://gerrit.libreoffice.org/6642
Tested-by: LibreOffice gerrit bot <gerrit@libreoffice.org>
Reviewed-by: Michael Stahl <mstahl@redhat.com>