fmin/fmax not defined

[reed]

src/live_effects/lpe-dynastroke.cpp uses fmin and fmax.

Some platforms don't have that. So I added to
src/live_effects/lpe-dynastroke.cpp :

#define fmin(a,b) ((a)<(b)?(a):(b))
#define fmax(a,b) ((a)>(b)?(a):(b))

Also work/inkscape-21256/src/display/nr-filter.cpp refers to fmax but it
is commented out.

[reed (reed-reedmedia)]

This problem continues in snapshot 22440.

[Alex Valavanis (valavanisalex)]

This is no longer necessary in C++11 as the functions became part of the standard in <cmath>