Fix mistake in function extraTryFontsForFamily

Taiwan and mainland China were inverted in the extraTryFontsForFamily
method. This patch fixes it and makes sure to match the rest of the
Chinese LANGIDs.

Task-number: QTBUG-33307
Change-Id: I45048ff5e9c00d20f8e922902701129e80ed459d
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>
Remove reference to gdb_dwarf_index from the freebsd-clang mkspec.

Follow-up to 9de2853a ("Remove automated generation of dwarf index"):
gdb_dwarf_index.prf does not exist anymore, so stop referencing it.

Change-Id: I22464d5b81a50a2f58218d74a424f3a790aa1df0
Reviewed-by: Gabriel de Dietrich <gabriel.dedietrich@digia.com>
refactor disconnectFromFtp to remove cached entries when necessary

In cases where a cached ftp connection fails to connect, or a file
transfer has failed, we should removed the cached connection. Since qnam
has an idea of a single internal QFtp per full operation, when file
transfers failed previously the cached connection would be reused for
subsequent connections and thus fail.

[ChangeLog][QtNetwork][QNetworkAccessManager] QNetworkAccessManager now
properly handles FTP transfer failures by removing failed cached ftp
connections.

Task-number: QTBUG-40797
Change-Id: Ie090a39ceddd7e58a0d8baf7d01f2a08c70162e5
Reviewed-by: Richard J. Moore <rich@kde.org>