Save 314 bytes on not handling contexts in core

conf/sparc64-ieee1275.rmk

@@ -31,7 +31,7 @@ kernel_img_HEADERS = boot.h cache.h device.h disk.h dl.h elf.h elfload.h \
 	partition.h msdos_partition.h reader.h symbol.h term.h time.h types.h \
 	list.h handler.h command.h i18n.h \
 	sparc64/libgcc.h ieee1275/ieee1275.h machine/kernel.h \
-	sparc64/ieee1275/ieee1275.h
+	sparc64/ieee1275/ieee1275.h env_private.h
 kernel_img_SOURCES = kern/sparc64/ieee1275/crt0.S kern/ieee1275/cmain.c	\
 	kern/ieee1275/ieee1275.c kern/main.c kern/device.c		\
 	kern/disk.c kern/dl.c kern/err.c kern/file.c kern/fs.c		\