Bug 1519042 - Remove special case adding -xgot assembly flag on NetBSD. r=ted

None of the values tested against OS_TEST are actually possible per
split_triplet in build/moz.configure/init.configure, so the code is
dead in practice.

Differential Revision: https://phabricator.services.mozilla.com/D16161

--HG--
extra : moz-landing-system : lando

config/rules.mk

@@ -319,15 +319,6 @@ EXTRA_DSO_LDOPTS	+= -dynamiclib -install_name $(_LOADER_PATH)/$(SHARED_LIBRARY)
 endif
 endif
 
-ifeq ($(OS_ARCH),NetBSD)
-ifneq (,$(filter arc cobalt hpcmips mipsco newsmips pmax sgimips,$(OS_TEST)))
-ifneq (,$(filter layout/%,$(relativesrcdir)))
-OS_CFLAGS += -Wa,-xgot
-OS_CXXFLAGS += -Wa,-xgot
-endif
-endif
-endif
-
 ifdef SYMBOLS_FILE
 ifeq ($(OS_TARGET),WINNT)
 ifndef GNU_CC