gdb: set --without-ust for EXTRA_OEFLAGS

Disable using UST since there are some compiler errors with
the newer version of lttng-ust 0.12, there may be other unknow
problems, so wait for upstream fixes.

(From OE-Core rev: b4a0124d2896276e115d20585dc0657da36a0846)

Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/gdb/gdb-common.inc

@@ -29,7 +29,10 @@ EXPAT = "--without-expat"
 
 EXTRA_OECONF = "--disable-gdbtk --disable-tui --disable-x \
                 --with-curses --disable-multilib --with-system-readline --disable-sim \
-                ${GDBPROPREFIX} --with-libelf=${STAGING_DIR_TARGET} ${EXPAT}"
+                ${GDBPROPREFIX} --with-libelf=${STAGING_DIR_TARGET} ${EXPAT} \
+                --without-ust \
+               "
+
 GDBPROPREFIX = "--program-prefix=''"
 
 do_configure () {