Deal with PGI compilers on the Mac by initializing a global variable.

cmr:v1.6.6:reviewer=jsquyres
cmr:v1.7.3:reviewer=jsquyres

This commit was SVN r29129.

orte/mca/odls/base/odls_base_frame.c

@@ -59,7 +59,7 @@
 /*
  * Instantiate globals
  */
-orte_odls_base_module_t orte_odls;
+orte_odls_base_module_t orte_odls = {0};
 
 /*
  * Framework global variables