Disable XPMEM until MOFED driver is available

 Changes to be committed:
	modified:   ucx.spec

SPECS/ucx/ucx.spec

@@ -124,7 +124,7 @@ Provides header files and examples for developing with UCX.
            %_with_arg knem knem \
            %_with_arg rdmacm rdmacm \
            %_with_arg rocm rocm \
-           %_with_arg xpmem xpmem \
+           --without-xpmem \
            %_with_arg vfs fuse3 \
            %_with_arg ugni ugni \
            %_with_arg mad mad \