Libunwind: Remove unused function
Libunwind: Remove unused function

For build-system CFLAGS clean-up.

Bug: 18632512
Change-Id: Ib2a0a5e47ed2f8cbaf7eb4c6032f3bb18f4bbff6

zeldin/platform_external_libunwind,SyndicateRogue/libunwind,SyndicateRogue/libunwind,zeldin/platform_external_libunwind,SyndicateRogue/libunwind,zeldin/platform_external_libunwind