package/grpc: remove BR2_TOOLCHAIN_HAS_GCC_BUG_85180 dead code

This work-around was added in commit
716f8b34c526c702aa19e9a66a25df5d3a6ea663 ("package/grpc: work around
gcc bug 85180") to work around a bug on Microblaze. However, since
commit
ae0557403a3a4cbf5354f0ab1784a08623382e5e ("package/libabseil-cpp: add
BR2_PACKAGE_LIBABSEIL_CPP_ARCH_SUPPORTS"), grpc depends on
libaseil-cpp, which isn't available on Microblaze, making the
GCC_BUG_85180 no longer needed, and effectively dead code. This commit
drops it.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Arnout Vandecappelle <arnout@mind.be>

package/grpc/grpc.mk

@@ -59,11 +59,6 @@ GRPC_CFLAGS += -DGPR_DISABLE_WRAPPED_MEMCPY
 GRPC_CXXFLAGS += -DGPR_DISABLE_WRAPPED_MEMCPY
 endif
 
-ifeq ($(BR2_TOOLCHAIN_HAS_GCC_BUG_85180),y)
-GRPC_CFLAGS += -O0
-GRPC_CXXFLAGS += -O0
-endif
-
 GRPC_CONF_OPTS += \
 	-DCMAKE_C_FLAGS="$(GRPC_CFLAGS)" \
 	-DCMAKE_CXX_FLAGS="$(GRPC_CXXFLAGS)"