optional .out in try_compile

[chakli]

Hello @arsv

In try_compile the extension seems to be optional (parameter?)

try_compile() {
	require 'cc'
	require '_o'

but in checksize() readelf and objdump checks seem to use a hard-coded .out extension

	if not try_readelf --syms > try.out 2>>$cfglog; then

[chakli]

Sorry please ignore this, my mistake.