In ab70693 @viric says zsnes works better without stripping. But the
build expression kept the $STRIP in the compiler options, so if it is
set to something it will show up in there. For example:
g++ -pipe -I. -I/usr/local/include -I/usr/include -D__UNIXSDL__ -I/nix/store/04qgmdpmalgsy92zgs2z896jx073hcn2-SDL-1.2.15-dev/include/SDL -I/nix/store/04qgmdpmalgsy92zgs2z896jx073hcn2-SDL-1.2.15-dev/include/SDL -D_GNU_SOURCE=1 -D_REENTRANT -DNCURSES -D__OPENGL__ -march=native -O3 -fomit-frame-pointer -fprefetch-loop-arrays -fforce-addr strip -D__RELEASE__ -fno-rtti -o tools/fileutil.o -c tools/fileutil.cpp
g++: error: strip: No such file or directory
This commit removes that reference to $STRIP too.