Speculative build fix for FreeBSD+GLIBC configuration
Speculative build fix for FreeBSD+GLIBC configuration

See
https://github.com/mamedev/mame/commit/a1f9b62dd0a491d6b26291837d43181c0e9e66fa

bkaradzic/imgui,nProtect/imgui,Pagghiu/imgui,cmaughan/imgui,ocornut/imgui,wflohry/imgui-addons,dougbinks/imgui,wflohry/imgui-addons,burningreggae/imgui,thennequin/imgui,thevaber/imgui,Pagghiu/imgui,ggtucker/imgui,burningreggae/imgui,mikesart/imgui,mikesart/imgui,dougbinks/imgui,wasikuss/imgui,aimotive/imgui-glfw,cmaughan/imgui,tom-seddon/imgui,cmaughan/imgui,Flix01/imgui,Flix01/imgui,seanmiddleditch/imgui,bkaradzic/imgui,Flix01/imgui,wasikuss/imgui,ocornut/imgui,Psybrus/imgui,nProtect/imgui,seanmiddleditch/imgui,thennequin/imgui,ocornut/imgui,aimotive/imgui-glfw,nProtect/imgui,elect86/imgui,thevaber/imgui,ggtucker/imgui,ggtucker/imgui,tom-seddon/imgui,cmaughan/imgui,bkaradzic/imgui,elect86/imgui,Psybrus/imgui