K 10
svn:author
V 6
marino
K 8
svn:date
V 27
2015-04-02T07:28:49.734739Z
K 7
svn:log
V 284
x11/sessreg: Fix build on gcc-5, take II

The previous attempt to fix sessreg on gcc5 by using tradcpp was backed
out due to failure to build on FreeBSD 11.  This attempt uses gcc's cpp,
but with the -P option.  Tested on F8,9,10,11 x i386,amd64

tested by:	bofh
Approved by:	blanket

END