Fix build issue when building with --disable-dlopen.

This commit was SVN r27945.

ompi/mca/pml/bfo/Makefile.am

@@ -52,6 +52,12 @@ bfo_sources  = \
 	pml_bfo_sendreq.h \
 	pml_bfo_start.c 
 
+# If we have CUDA support requested, build the CUDA file also
+if MCA_ompi_cuda_support
+bfo_sources += \
+    pml_bfo_cuda.c
+endif
+
 if MCA_BUILD_ompi_pml_bfo_DSO
 component_noinst =
 component_install = mca_pml_bfo.la