stand/uboot: Fix building of ubldr.bin

Sponsored by:		Netflix
Reviewed by:		kevans
Differential Revision:	https://reviews.freebsd.org/D34189

stand/uboot/Makefile

@@ -15,9 +15,9 @@ LOADER_DISK_SUPPORT?=	yes
 
 .include "${.CURDIR}/arch/${MACHINE_CPUARCH}/Makefile.inc"
 
-.if ${MK_PIE} == "yes"
+LOADER_UBLDR_BIN?=	yes
+.if ${LOADER_UBLDR_BIN} != "no"
 FILES+=		ubldr ubldr.bin
-OBJS+=  ${SRCS:N*.h:R:S/$/.o/g}
 .else
 PROG=		ubldr
 .endif
@@ -75,6 +75,11 @@ CFLAGS+=	-I${FDTSRC}
 CFLAGS+= -DDISK_DEBUG
 .endif
 
+.if ${LOADER_UBLDR_BIN} != "no"
+OBJS+=  ${SRCS:N*.h:R:S/$/.o/g}
+ubldr ubldr.bin ubldr.pie: ${OBJS}
+.endif
+
 DPADD=		${LDR_INTERP} ${LIBFDT} ${LIBSA}
 LDADD=		${LDR_INTERP} ${LIBFDT} ${LIBSA}
 

stand/uboot/arch/powerpc/Makefile.inc

@@ -3,4 +3,4 @@ SRCS+=		start.S conf.c ppc64_elf_freebsd.c
 .PATH:		${SYSDIR}/libkern
 SRCS+=		ucmpdi2.c
 
-MK_PIE=		no
+LOADER_UBLDR_BIN=	no