Add missing bit for ppc64el fix of #970014
As explained in the bug, components/chmhelp/lhelp/Makefile.fp forces debug info type to Stabs (-gs) :
- which breaks on ppc64el
- and where Dwarf is actually recommended everyware (-gw) : https://wiki.freepascal.org/GDB_Debugger_Tips#Stabs_.28only_GDB.29
That builds well on ppc64el, amd64, i386.