Don't look for the coretemp file when configuring as it might not be on the head node, but is available on the backend

Refs trac:4176

This commit was SVN r30461.

The following Trac tickets were found above:
  Ticket 4176 --> https://svn.open-mpi.org/trac/ompi/ticket/4176

orte/mca/sensor/coretemp/configure.m4

@@ -21,18 +21,9 @@ AC_DEFUN([MCA_orte_sensor_coretemp_CONFIG], [
     # do not build if support not requested
     AS_IF([test "$with_coretemp" != "no"],
           [AS_IF([test "$opal_found_linux" = "yes"],
-                 [AS_IF([test -r "/sys/bus/platform/devices/coretemp.0"],
-                        [sensor_coretemp_happy=yes],
-                        [AC_MSG_WARN([Core temperature sensing was requested but the required directory])
-                         AC_MSG_WARN([was not found. This usually indicates that the \"coretemp\"])
-                         AC_MSG_WARN([kernel module is not installed. Please install the module])
-                         AC_MSG_WARN([and try again, or remove the core temperature sensing request.])
-                         sensor_coretemp_happy=no])],
-                 [AC_MSG_WARN([Core temperature sensing was requested but is only supported on Linux systems])
-                  sensor_coretemp_happy=no])
-           AS_IF([test "$sensor_coretemp_happy" = "yes"],
                  [$1],
-                 [AC_MSG_ERROR([Cannot continue])
+                 [AC_MSG_WARN([Core temperature sensing was requested but is only supported on Linux systems])
+                  AC_MSG_ERROR([Cannot continue])
                   $2])
           ],
           [$2])