efi_selftest: compiler flags for efi_selftest_miniapp_exception.o

Add $(CFLAGS_EFI) and remove $(CFLAGS_NON_EFI) for
efi_selftest_miniapp_exception.o.

The removal is needed when compiling with LTO - this object file needs
to be compiled without -flto.

The adding is for consistency with other miniapps.

Signed-off-by: Marek BehĂșn <marek.behun@nic.cz>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/lib/efi_selftest/Makefile b/lib/efi_selftest/Makefile
index aa71d09..9ff6e17 100644
--- a/lib/efi_selftest/Makefile
+++ b/lib/efi_selftest/Makefile
@@ -10,6 +10,8 @@
 
 CFLAGS_dtbdump.o := $(CFLAGS_EFI) -Os -ffreestanding
 CFLAGS_REMOVE_dtbdump.o := $(CFLAGS_NON_EFI)
+CFLAGS_efi_selftest_miniapp_exception.o := $(CFLAGS_EFI) -Os -ffreestanding
+CFLAGS_REMOVE_efi_selftest_miniapp_exception.o := $(CFLAGS_NON_EFI)
 CFLAGS_efi_selftest_miniapp_exit.o := $(CFLAGS_EFI) -Os -ffreestanding
 CFLAGS_REMOVE_efi_selftest_miniapp_exit.o := $(CFLAGS_NON_EFI)
 CFLAGS_efi_selftest_miniapp_return.o := $(CFLAGS_EFI) -Os -ffreestanding