Update mlterm to 3.3.8.

pkgsrc changes:
 - remove post-3.3.7 fix patches

Changes noted in doc/en/ReleaseNote:

ver 3.3.8
* Support rectangle selection by pressing alt key while selecting.
* Support DECDMAC/DECINVM.
* Start scp by drag&drop a file with shift key to the screen on ssh connection.
* Add --seqfmt/vt_seq_format option.
* Read /dev/kbd on NetBSD/x68k framebuffer.
* Add "Auto detect" entry to "Encoding" tab of mlconfig.
* Add "Local echo" checkbox to "Others" tab in mlconfig.
* Bug fixes:
  Fix weird background picture on NetBSD/x68k Text VRAM by unexpectedly cached pixels.
Updated x11/mlterm to 3.3.8
serf-0.3.7 [CVE-2014-3504]