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

configure.ac

@@ -463,6 +463,15 @@ if test "${with_pjproject}" = "no" || test "${with_pjproject}" = "n" ; then
 	PJPROJECT_BUNDLED=no
 fi
 
+LIBJWT_BUNDLED=no
+AC_ARG_WITH([libjwt-bundled],
+	[AS_HELP_STRING([--with-libjwt-bundled],
+		[Use bundled libjwt library])],
+	[case "${withval}" in
+		y|ye|yes) LIBJWT_BUNDLED=yes ;;
+		*) LIBJWT_BUNDLED=no ;;
+	esac])
+
 #
 # OpenSSL stuff has to be done here because we want to pass
 # any resulting CFLAGS and LDFLAGS to the bundled pjproject
@@ -554,6 +563,7 @@ AST_EXT_LIB_SETUP([LDAP], [OpenLDAP], [ldap])
 AST_LIBCURL_CHECK_CONFIG([], [7.10.1])
 AST_EXT_LIB_SETUP([LIBEDIT], [NetBSD Editline library], [libedit])
 AST_EXT_LIB_SETUP_OPTIONAL([LIBEDIT_IS_UNICODE], [Libedit compiled for unicode], [LIBEDIT], [libedit])
+AST_EXT_LIB_SETUP([LIBJWT], [LIBJWT], [libjwt])
 AST_EXT_LIB_SETUP([LIBXML2], [LibXML2], [libxml2])
 AST_EXT_LIB_SETUP([LIBXSLT], [LibXSLT], [libxslt])
 AST_EXT_LIB_SETUP_OPTIONAL([LIBXSLT_CLEANUP], [LibXSLT Library Cleanup Function], [LIBXSLT], [libxslt])
@@ -738,6 +748,14 @@ else
 	PBX_JANSSON=1
 fi
 
+source ./third-party/versions.mak
+# Find required JWT support if bundled is not enabled.
+if test "$LIBJWT_BUNDLED" = "no" ; then
+	AST_PKG_CONFIG_CHECK([LIBJWT], [libjwt >= $LIBJWT_VERSION])
+else
+	PBX_LIBJWT=1
+fi
+
 # See if clock_gettime is in librt
 AST_EXT_LIB_CHECK([RT], [rt], [clock_gettime], [])