Restore kgzldr on i386 only

I previously disconnected kgzdr based on a misunderstanding.

I'd still like to transition to supporting only the loader(8)-based
boot path for handling compressed kernels, but that can follow the
standard deprecation procedure.

This reverts r291113.

Requested by:	dteske

sys/boot/i386/Makefile

@@ -8,6 +8,10 @@ SUBDIR=		mbr pmbr boot0 boot0sio btx boot2 cdboot gptboot \
 # special boot programs, 'self-extracting boot2+loader'
 SUBDIR+=	pxeldr
 
+.if ${MACHINE_CPUARCH} == "i386"
+SUBDIR+=	kgzldr
+.endif
+
 .if ${MK_ZFS} != "no"
 SUBDIR+=	zfsboot gptzfsboot zfsloader
 .endif

targets/pseudo/userland/misc/Makefile.depend

@@ -40,6 +40,7 @@ DIRDEPS.x86sys= \
 	sys/boot/i386/btx/lib \
 	sys/boot/i386/cdboot \
 	sys/boot/i386/gptboot \
+	sys/boot/i386/kgzldr \
 	sys/boot/i386/libfirewire \
 	sys/boot/i386/libi386 \
 	sys/boot/i386/loader \