FS-6450 [unimrcp] Update library

[apr] Backport APR_RING_FOREACH and APR_RING_FOREACH_SAFE macros to APR for unimrcp compatibility.

 [unimrcp] configure.gnu - need full path, not relative path for library paths

 [unimrcp] added uni_revision.h - couldn't get it to autogenerate from build

 [mod_unimrcp] add better logging and error checking on module load.  Currently dumps core on MRCPv1 TTS attempt

 [mod_unimrcp] don't configure MRCPv1 session with a connection agent- causes crash

libs/unimrcp/config.layout

@@ -0,0 +1,26 @@
+##
+##  config.layout -- Pre-defined Installation Path Layouts
+##
+##  Hints:
+##  - layouts can be loaded with configure's --enable-layout=ID option
+##  - when no --enable-layout option is given, the default layout is `classic'
+
+# Classical UniMRCP path layout.
+<Layout classic>
+    prefix:          /usr/local/unimrcp
+    exec_prefix:     ${prefix}
+    bindir:          ${exec_prefix}/bin
+    sbindir:         ${exec_prefix}/bin
+    libdir:          ${exec_prefix}/lib
+    libexecdir:      ${exec_prefix}/modules
+    mandir:          ${prefix}/man
+    sysconfdir:      ${prefix}/conf
+    confdir:         ${prefix}/conf
+    datadir:         ${prefix}/data
+    plugindir:       ${exec_prefix}/plugin
+    logdir:          ${exec_prefix}/log
+    vardir:          ${exec_prefix}/var
+    installbuilddir: ${exec_prefix}/build
+    includedir:      ${prefix}/include
+    localstatedir:   ${prefix}
+</Layout>