fpc: Generate a default configuration file
fpc: Generate a default configuration file

The file provides a set of default paths and options, which help in
unit search paths (equivalent to C search paths) so that formulas won't
need to specify them when needed. All options and variables can be
overridden at any time on the command line.

Add an unused unit to the test section to check that the search path
is always correctly set.

Fix Homebrew/homebrew#45783.

Closes Homebrew/homebrew#46021.

Signed-off-by: Mike McQuaid <a17fed27eaa842282862ff7c1b9c8395a26ac320@mikemcquaid.com>

passerbyid/homebrew-core,lembacon/homebrew-core,j-bennet/homebrew-core,zmwangx/homebrew-core,mbcoguno/homebrew-core,filcab/homebrew-core,chrisfinazzo/homebrew-core,dsXLII/homebrew-core,makigumo/homebrew-core,tkoenig/homebrew-core,forevergenin/homebrew-core,kunickiaj/homebrew-core,rwhogg/homebrew-core,wolffaxn/homebrew-core,ylluminarious/homebrew-core,maxim-belkin/homebrew-core,bcg62/homebrew-core,moderndeveloperllc/homebrew-core,fvioz/homebrew-core,mfikes/homebrew-core,zyedidia/homebrew-core,mfikes/homebrew-core,aabdnn/homebrew-core,DomT4/homebrew-core,LinuxbrewTestBot/homebrew-core,Homebrew/homebrew-core,mbcoguno/homebrew-core,ShivaHuang/homebrew-core,ilovezfs/homebrew-core,adamliter/homebrew-core,mahori/homebrew-core,ilovezfs/homebrew-core,bigbes/homebrew-core,bcg62/homebrew-core,git-lfs/homebrew-core,fvioz/homebrew-core,battlemidget/homebrew-core,passerbyid/homebrew-core,adamliter/homebrew-core,filcab/homebrew-core,j-bennet/homebrew-core,jvillard/homebrew-core,Moisan/homebrew-core,jdubois/homebrew-core,stgraber/homebrew-core,smessmer/homebrew-core,wolffaxn/homebrew-core,adam-moss/homebrew-core,reelsense/homebrew-core,forevergenin/homebrew-core,FinalDes/homebrew-core,andyjeffries/homebrew-core,sdorra/homebrew-core,BrewTestBot/homebrew-core,lembacon/homebrew-core,lemzwerg/homebrew-core,sjackman/homebrew-core,aren55555/homebrew-core,uyjulian/homebrew-core,spaam/homebrew-core,zyedidia/homebrew-core,zmwangx/homebrew-core,kuahyeow/homebrew-core,straxhaber/homebrew-core,moderndeveloperllc/homebrew-core,lembacon/homebrew-core,mvitz/homebrew-core,mahori/homebrew-core,jvehent/homebrew-core,nbari/homebrew-core,mvbattista/homebrew-core,LinuxbrewTestBot/homebrew-core,jvehent/homebrew-core,BrewTestBot/homebrew-core,bfontaine/homebrew-core,tkoenig/homebrew-core,lasote/homebrew-core,wolffaxn/homebrew-core,Moisan/homebrew-core,gserra-olx/homebrew-core,smessmer/homebrew-core,mbcoguno/homebrew-core,phusion/homebrew-core,Homebrew/homebrew-core,Linuxbrew/homebrew-core,aabdnn/homebrew-core,jdubois/homebrew-core,cblecker/homebrew-core,battlemidget/homebrew-core,nandub/homebrew-core,FinalDes/homebrew-core,bfontaine/homebrew-core,bcg62/homebrew-core,Linuxbrew/homebrew-core,JCount/homebrew-core,mvitz/homebrew-core,uyjulian/homebrew-core,sdorra/homebrew-core,kuahyeow/homebrew-core,lemzwerg/homebrew-core,grhawk/homebrew-core,jvillard/homebrew-core,aren55555/homebrew-core,grhawk/homebrew-core,ShivaHuang/homebrew-core,robohack/homebrew-core,jvillard/homebrew-core,JCount/homebrew-core,bigbes/homebrew-core,jdubois/homebrew-core,mvbattista/homebrew-core,rwhogg/homebrew-core,robohack/homebrew-core,jabenninghoff/homebrew-core,spaam/homebrew-core,ylluminarious/homebrew-core,andyjeffries/homebrew-core,dsXLII/homebrew-core,lasote/homebrew-core,edporras/homebrew-core,gserra-olx/homebrew-core,DomT4/homebrew-core,stgraber/homebrew-core,maxim-belkin/homebrew-core,nandub/homebrew-core,sjackman/homebrew-core,straxhaber/homebrew-core,adam-moss/homebrew-core,mvitz/homebrew-core,reelsense/homebrew-core,git-lfs/homebrew-core,kunickiaj/homebrew-core,chrisfinazzo/homebrew-core,nbari/homebrew-core,cblecker/homebrew-core,jabenninghoff/homebrew-core,phusion/homebrew-core,makigumo/homebrew-core,edporras/homebrew-core