Fix a code clarity issue in the POE PLS.

Allow the POE RAS to be compled for linux as well as AIX.
The POE RAS is really a Loadleveler RAS, and IU now has
a cluster that uses Loadleveler in a Linux environment (BigRed).

This seems to be the only thing we need to do so far to run 
Open MPI on BigRed. Yay :)

This commit was SVN r11600.

orte/mca/pls/poe/pls_poe_module.c

@@ -604,7 +604,7 @@ pls_poe_launch - launch a POE job
 */
 static int pls_poe_launch(orte_jobid_t jobid)
 {
-    if(!strncmp(mca_pls_poe_component.class,"interactive",11)) {
+    if(0 == strncmp(mca_pls_poe_component.class,"interactive",11)) {
         return poe_launch_interactive(jobid);
     }
     return ORTE_ERR_NOT_IMPLEMENTED;

orte/mca/ras/poe/configure.m4

@@ -21,12 +21,14 @@
 # -----------------------------------------------------------
 
 AC_DEFUN([MCA_ras_poe_CONFIG],[
-    # POE is only supported on AIX.  We only need executables (no
-    # header files or libraries), but those can be found (or not) at
-    # run-time.  So if we're on AIX, build this component.
-    AC_MSG_CHECKING([if on AIX])
+    # POE used to be only supported on AIX. Now we support it on
+    # AIX and some IBM Linux Machines. 
+    # We only need executables (no header files or libraries), but 
+    # those can be found (or not) at run-time.  So if we're on AIX, 
+    # or Linux build this component.
+    AC_MSG_CHECKING([if on AIX or Linux])
     case $host_os in
-    aix3* | aix4* | aix5*)
+    linux* | aix3* | aix4* | aix5*)
         happy=yes
         ;;
     *)