libselinux: use musl-fts for host builds

Fixes compilation under musl based distros like Alpine Linux.

Also add pcre/host as a build dependency as it's needed.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

package/libs/libselinux/Makefile

@@ -7,7 +7,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=libselinux
 PKG_VERSION:=3.3
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://github.com/SELinuxProject/selinux/releases/download/$(PKG_VERSION)
@@ -18,6 +18,8 @@ PKG_LICENSE:=libselinux-1.0
 PKG_LICENSE_FILES:=LICENSE
 PKG_MAINTAINER:=Thomas Petazzoni <thomas.petazzoni@bootlin.com>
 
+HOST_BUILD_DEPENDS:=musl-fts/host pcre/host
+
 include $(INCLUDE_DIR)/package.mk
 include $(INCLUDE_DIR)/host-build.mk
 
@@ -107,7 +109,8 @@ HOST_LDFLAGS += -Wl,-rpath="$(STAGING_DIR_HOSTPKG)/lib"
 
 HOST_MAKE_FLAGS += \
 	PREFIX=$(STAGING_DIR_HOSTPKG) \
-	SHLIBDIR=$(STAGING_DIR_HOSTPKG)/lib
+	SHLIBDIR=$(STAGING_DIR_HOSTPKG)/lib \
+	FTS_LDLIBS=-lfts
 
 ifeq ($(CONFIG_USE_MUSL),y)
 MAKE_FLAGS += FTS_LDLIBS=-lfts