Log Message:
Update xterm to 324:

Patch #324 - 2016/03/10

    updated configure macro CF_LD_RPATH_OPT from ncurses changes.
    provide alternate fix for Juha Nurmela's report by turning on POSIX signals \ 
if _POSIX_C_SOURCE is at least one. This is done to improve the behavior if a \ 
direct child process receives a STOP signal.
    revert change to CF_POSIX_C_SOURCE from patch #323 (reports by Ashish \ 
Shukla, Christian Weisgerber).

Patch #323 - 2016/03/07

    updated appdata and desktop files to add keywords (report by Richard Hughes).
    modify configure macro CF_POSIX_C_SOURCE to accommodate some systems, e.g., \ 
FreeBSD, which have separated their implementation specific preprocessor symbols \ 
from the POSIX ones, requiring both to be defined (report by Juha Nurmela).
    change the directory to the current working dir of the child process in \ 
exec-formatted and exec-selectable actions (patch by Alexander Pohoyda).
    correct typo in xterm.man (patch by Larry Hynes).
    correct typo in ctlseqs.ms (report by Shriramana Sharma).
    add feature to support XHTML and SVG screen dumps (patch by Jens Schweikhardt).
    correct response to DECRQSS when terminal id is less than 400 (patch by \ 
Iwamoto Kouichi).