MFH: r414807

During the exp-run in bug 208158, it was found that deskutils/easystroke
gives errors with libc++ 3.8.0:

handler.cc:536:21: error: static declaration of 'abs' follows non-static declaration
static inline float abs(float x) { return x > 0 ? x : -x; }

^

/usr/include/c++/v1/math.h:646:1: note: previous definition is here
abs(float lcpp_x) _NOEXCEPT {return fabsf(lcpp_x);}
^

This is because easystroke tries to roll its own version of abs(), which
is already defined in math.h. Fix this by removing the custom abs().

Approved by: portmgr (feld)
PR: 209372