games/pingus can't find boost_signals

["John D. Baker" <jdbaker%consolidated.net@localhost>]

Anticipating the freeze before pkgsrc-2018Q4, I've updated a test system
(NetBSD-8.0_STABLE, amd64) to pkgsrc-HEAD and have run pkg_rolling-replace
over it (with "-k").

"games/pingus" fails during the configure phase with:

[...]
Checking for C++ library iconv_std... no
Check how to call iconv...use 'const'
Reports:
  * Linux USB mouse support: ok
  * Linux evdev support: disabled
  * Wiimote support: disabled
  * XInput support: disabled

Fatal Errors:
  * library 'boost_signals' not found

*** Error code 1

Stop.
make[1]: stopped in /d0/nbsd/pkgsrc/games/pingus
*** Error code 1

Stop.
make: stopped in /d0/nbsd/pkgsrc/games/pingus


Needs update for newer "boost", perhaps?

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