Add libjwt to third-party

The current STIR/SHAKEN implementation is not currently usable due
to encryption issues. Rather than trying to futz with OpenSSL and
the the current code, we can take advantage of the existing
capabilities of libjwt but we first need to add it to the
third-party infrastructure already in place for jansson and
pjproject.

A few tweaks were also made to the third-party infrastructure as
a whole.  The jansson "dest" install directory was renamed "dist"
to better match convention, and the third-party Makefile was updated
to clean all product directories not just the ones currently in
use.

Resolves: #349

third-party/Makefile

@@ -2,6 +2,8 @@
 -include ../makeopts
 include Makefile.rules
 
+TP_ALL_SUBDIRS := jansson pjproject libjwt
+
 TP_SUBDIRS :=
 # Sub directories that contain special install/uninstall targets must be explicitly listed
 # to prevent accidentally running the package's default install target.
@@ -17,18 +19,31 @@ TP_SUBDIRS += jansson
 TP_INSTALL_SUBDIRS += jansson
 endif
 
-.PHONY: all dist-clean distclean install clean moduleinfo makeopts uninstall $(TP_SUBDIRS)
-
-ifneq ($(TP_SUBDIRS),)
+ifeq ($(LIBJWT_BUNDLED),yes)
+TP_SUBDIRS += libjwt
+TP_INSTALL_SUBDIRS += libjwt
+libjwt: jansson
+export JANSSON_CFLAGS=$(JANSSON_INCLUDE)
+export JANSSON_LIBS=$(JANSSON_LIB)
+endif
 
 override MAKECMDGOALS?=all
-
 MAKECMDGOALS:=$(subst dist-clean,distclean,$(MAKECMDGOALS))
 
-all distclean dist-clean install uninstall clean : $(TP_SUBDIRS)
-install uninstall: $(TP_INSTALL_SUBDIRS)
+.PHONY: all dist-clean distclean install clean moduleinfo makeopts uninstall $(TP_ALL_SUBDIRS)
 
-$(TP_SUBDIRS):
+ifeq ($(findstring clean,$(MAKECMDGOALS)),clean)
+distclean dist-clean clean : $(TP_ALL_SUBDIRS)
+TP_RUN_SUBDIRS := $(TP_ALL_SUBDIRS)
+else
+all install uninstall : $(TP_SUBDIRS)
+install uninstall: $(TP_INSTALL_SUBDIRS)
+TP_RUN_SUBDIRS := $(TP_SUBDIRS)
+endif
+
+ifneq ($(TP_RUN_SUBDIRS),)
+
+$(TP_RUN_SUBDIRS):
 	+$(CMD_PREFIX) $(SUBMAKE) -C $@ $(MAKECMDGOALS)
 
 endif