emulators/mame: fix build on armv7

Mame fails to link on armv7 due to an address space exhaustion in lld.
As a bandaid, tell lld to not generate symbols.  This frees up enough
address space to make mame link.

PR:		271374
MFH:		2023Q2
Approved by:	agh@riseup.net (maintainer)