boot1.efi: Don't redundantly include devpath.c

devpath.c is on both the comand line and in libefi. This is redundant
and was a mistake in 4cf36aa101. It never should have been here. In
practice, this just means that the devpath.o from libefi.a goes unused.
This will cause problems with some upcoming changes (D44872) to enable
LTO to reduce the size of the binaries, so go ahead and make the change
now to reduce the changeset for that. No functional change indended.

Fixes:		4cf36aa101
Co-authored-by:	sobomax
Sponsored by:	Netflix

stand/efi/boot1/Makefile

@@ -29,7 +29,7 @@ CWARNFLAGS.zfs_module.c += -Wno-unused-parameter
 CWARNFLAGS.zfs_module.c += -Wno-unused-function
 
 # architecture-specific loader code
-SRCS+=	boot1.c proto.c self_reloc.c start.S ufs_module.c devpath.c
+SRCS+=	boot1.c proto.c self_reloc.c start.S ufs_module.c
 .if ${MK_LOADER_ZFS} != "no"
 SRCS+=		zfs_module.c
 CFLAGS.zfs_module.c+=	-I${ZFSSRC}
@@ -58,7 +58,6 @@ CFLAGS+=	-DEFI_DEBUG
 .PATH:		${EFISRC}/loader/arch/${MACHINE}
 .PATH:		${EFISRC}/loader
 .PATH:		${LDRSRC}
-.PATH:		${EFISRC}/libefi
 CFLAGS+=	-I${LDRSRC}
 
 FILES=	${BOOT1}.efi