Upgrade bundled pjproject to 2.15.1

Resolves: asterisk#1016

UserNote: Bundled pjproject has been upgraded to 2.15.1. For more
information visit pjproject Github page: https://github.com/pjsip/pjproject/releases/tag/2.15.1

(cherry picked from commit 2e8d8c4a08)

third-party/pjproject/patches/0000-configure-ssl-library-path.patch

@@ -2,7 +2,7 @@ diff --git a/aconfigure b/aconfigure
 index d6f0e8809..9dcd46398 100755
 --- a/aconfigure
 +++ b/aconfigure
-@@ -8986,7 +8986,11 @@ else $as_nop
+@@ -9768,7 +9768,11 @@
          if test "x$with_ssl" != "xno" -a "x$with_ssl" != "x"; then
              CFLAGS="$CFLAGS -I$with_ssl/include"
              CPPFLAGS="$CPPFLAGS -I$with_ssl/include"
@@ -19,7 +19,7 @@ diff --git a/aconfigure.ac b/aconfigure.ac
 index 16b311045..849da81ab 100644
 --- a/aconfigure.ac
 +++ b/aconfigure.ac
-@@ -1838,7 +1838,11 @@ AC_ARG_ENABLE(ssl,
+@@ -2172,7 +2172,11 @@
          if test "x$with_ssl" != "xno" -a "x$with_ssl" != "x"; then
              CFLAGS="$CFLAGS -I$with_ssl/include"
              CPPFLAGS="$CPPFLAGS -I$with_ssl/include"

third-party/pjproject/pjproject-2.14.1.tar.bz2.md5

@@ -1 +0,0 @@
-de9feca3e4816b1535f63f9d23c7b45b  pjproject-2.14.1.tar.bz2

third-party/pjproject/pjproject-2.15.1.tar.bz2.md5

@@ -0,0 +1 @@
+6b4b34c14d39224d3342d368f5abbad4  pjproject-2.15.1.tar.bz2

third-party/versions.mak

@@ -2,5 +2,5 @@
 # configure script so it must follow 'shell'
 # syntax as well as 'make' syntax.
 JANSSON_VERSION=2.14
-PJPROJECT_VERSION=2.14.1
+PJPROJECT_VERSION=2.15.1
 LIBJWT_VERSION=1.15.3