pc-bios/optionrom: detect -fno-pie

Do not rely on the detection that was done in the configure script,
since in the future we may want to cross-compile this file.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

configure

@@ -2038,7 +2038,6 @@ echo "CCAS=$ccas" >> $config_host_mak
 echo "CPP=$cpp" >> $config_host_mak
 echo "OBJCOPY=$objcopy" >> $config_host_mak
 echo "LD=$ld" >> $config_host_mak
-echo "CFLAGS_NOPIE=$CFLAGS_NOPIE" >> $config_host_mak
 echo "QEMU_CFLAGS=$QEMU_CFLAGS" >> $config_host_mak
 echo "QEMU_CXXFLAGS=$QEMU_CXXFLAGS" >> $config_host_mak
 echo "QEMU_OBJCFLAGS=$QEMU_OBJCFLAGS" >> $config_host_mak

pc-bios/optionrom/Makefile

@@ -22,7 +22,8 @@ override CFLAGS += $(call cc-option, -fcf-protection=none)
 override CPPFLAGS += -MMD -MP -MT $@ -MF $(@D)/$(*F).d
 
 override CFLAGS += $(filter -W%, $(QEMU_CFLAGS))
-override CFLAGS += $(CFLAGS_NOPIE) -ffreestanding -I$(TOPSRC_DIR)/include
+override CFLAGS += $(call cc-option, -fno-pie)
+override CFLAGS += -ffreestanding -I$(TOPSRC_DIR)/include
 override CFLAGS += $(call cc-option, -fno-stack-protector)
 override CFLAGS += $(call cc-option, -m16)