libsepol: rework host installation

libsepol has a pretty peculiar interpretation of DESTDIR and PREFIX.
PREFIX is not consistently used: some installation paths are forced to
$(DESTDIR)/usr/... . Also, the shared lib symlink is forced to ../../lib
(i.e. assumes it's installed under /usr). For these reasons, the host
build and install commands are a bit unusual: they use DESTDIR instead
of PREFIX, DESTDIR points to $(HOST_DIR) without /usr, and some
additional fixup is needed to correct the installation directory of
libsepol.so.1 and the symlink to it.

This can be simplified quite a lot by passing both DESTDIR and PREFIX,
and including the /usr part in both. The symlink still has to be fixed,
but that's much simpler.

Note that a side effect is that the man pages are now installed under
$(HOST_DIR)/usr/usr/man. While not very nice, we don't really care
about man pages. In addition, this will resolve itself when we later
move $(HOST_DIR)/usr to $(HOST_DIR).

Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/libsepol/libsepol.mk

@@ -33,15 +33,18 @@ define LIBSEPOL_INSTALL_TARGET_CMDS
 	$(TARGET_MAKE_ENV) $(MAKE) -C $(@D) install $(LIBSEPOL_MAKE_FLAGS) DESTDIR=$(TARGET_DIR)
 endef
 
+HOST_LIBSEPOL_MAKE_ENV = \
+	$(HOST_MAKE_ENV) \
+	DESTDIR=$(HOST_DIR)/usr \
+	PREFIX=$(HOST_DIR)/usr
+
 define HOST_LIBSEPOL_BUILD_CMDS
-	$(HOST_MAKE_ENV) $(MAKE) -C $(@D) $(HOST_CONFIGURE_OPTS) DESTDIR=$(HOST_DIR)
+	$(HOST_LIBSEPOL_MAKE_ENV) $(MAKE) -C $(@D) $(HOST_CONFIGURE_OPTS)
 endef
 
 define HOST_LIBSEPOL_INSTALL_CMDS
-	$(HOST_MAKE_ENV) $(MAKE) -C $(@D) install $(HOST_CONFIGURE_OPTS) DESTDIR=$(HOST_DIR)
-	mv $(HOST_DIR)/lib/libsepol.so.1 $(HOST_DIR)/usr/lib
-	(cd $(HOST_DIR)/usr/lib; rm -f libsepol.so; ln -s libsepol.so.1 libsepol.so)
-	-rmdir $(HOST_DIR)/lib
+	$(HOST_LIBSEPOL_MAKE_ENV) $(MAKE) -C $(@D) install $(HOST_CONFIGURE_OPTS)
+	ln -sf libsepol.so.1 $(HOST_DIR)/usr/lib/libsepol.so
 endef
 
 $(eval $(generic-package))