busybox: fix `'/dev/nul'*` != `/dev/null` issue.

cf. http://lists.busybox.net/pipermail/busybox/2018-March/086295.html

srcpkgs/busybox/files/busybox.dotconfig

@@ -40,7 +40,7 @@ CONFIG_PLATFORM_LINUX=y
 # Build Options
 #
 # CONFIG_STATIC is not set
-# CONFIG_PIE is not set
+CONFIG_PIE=y
 # CONFIG_NOMMU is not set
 # CONFIG_BUILD_LIBBUSYBOX is not set
 # CONFIG_FEATURE_LIBBUSYBOX_STATIC is not set

srcpkgs/busybox/template

@@ -19,15 +19,6 @@ alternatives="
  ntpd:ntpd:/etc/sv/busybox-ntpd
  vi:vi:/usr/bin/busybox"
 
-_cflags() {
-	local t=$1
-	local c="$CFLAGS"
-	case $t in
-		busybox-static) c="$c -static";;
-	esac
-	echo "$c"
-}
-
 do_configure() {
 	mkdir -p src
 	mv * src || true
@@ -35,10 +26,15 @@ do_configure() {
 	local t
 	for t in busybox busybox-static; do
 		mkdir -p $t
-		make -C $t CFLAGS="$(_cflags $t)" KBUILD_SRC=${wrksrc}/src \
-			-f ${wrksrc}/src/Makefile defconfig
+		make -C $t KBUILD_SRC=${wrksrc}/src -f ${wrksrc}/src/Makefile defconfig
 		cp -f ${FILESDIR}/${t}.dotconfig ${t}/.config
 
+		if [ "$t" = busybox-static ]; then
+			sed -e '/CONFIG_STATIC/ s/.*/CONFIG_STATIC=y/' \
+				-e '/CONFIG_PIE/ s/.*/# CONFIG_PIE is not set/' \
+				-i "$t"/.config
+		fi
+
 		case "$XBPS_TARGET_MACHINE" in
 		*-musl) sed -i -e /CONFIG_FEATURE_VI_REGEX_SEARCH/s/y/n/ \
 				-e /CONFIG_FEATURE_MOUNT_NFS/s/y/n/ \
@@ -62,7 +58,7 @@ do_configure() {
 do_build() {
 	local t
 	for t in busybox busybox-static; do
-		make -C $t SKIP_STRIP=y CFLAGS="$(_cflags $t)" LFLAGS="$LDFLAGS" ${makejobs}
+		make -C $t SKIP_STRIP=y ${makejobs}
 	done
 }
 do_check() {