libcap: use $(HOST_DIR) as prefix instead of DESTDIR

... and also remove the /usr prefix.

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

package/libcap/libcap.mk

@@ -63,8 +63,8 @@ define HOST_LIBCAP_BUILD_CMDS
 endef
 
 define HOST_LIBCAP_INSTALL_CMDS
-	$(HOST_MAKE_ENV) $(MAKE) -C $(@D) DESTDIR=$(HOST_DIR) \
-		RAISE_SETFCAP=no prefix=/usr lib=lib install
+	$(HOST_MAKE_ENV) $(MAKE) -C $(@D) prefix=$(HOST_DIR) \
+		RAISE_SETFCAP=no lib=lib install
 endef
 
 $(eval $(generic-package))