biology/seaview: Fix build with Clang 6
seaview.cxx:3352:24: error: invalid suffix on literal; C++11 requires a space between literal and identifier [-Wreserved-user-defined-literal]
strcat(suggested, "."PDF_OR_PS_EXT);
^http://beefy12.nyi.freebsd.org/data/head-amd64-default/p479076_s338486/logs/errors/seaview-4.7,1.log
PR: 230881
Submitted by: tobik
Approved by: bofh (maintainer timeout, 2 weeks)