Fix unused variable warnings in external PMIx case

Signed-off-by: Brian Barrett <bbarrett@amazon.com>

Author: bwbarrett

ompi/runtime/ompi_mpi_init.c

@@ -402,7 +402,9 @@ int ompi_mpi_init(int argc, char **argv, int requested, int *provided,
     ompi_proc_t** procs;
     size_t nprocs;
     char *error = NULL;
+#if OPAL_USING_INTERNAL_PMIX
     char *evar;
+#endif
     volatile bool active;
     bool background_fence = false;
     pmix_info_t info[2];

ompi/tools/mpirun/main.c

@@ -27,7 +27,10 @@
 
 int main(int argc, char *argv[])
 {
-    char *evar, *pvar;
+    char *evar;
+#if OPAL_USING_INTERNAL_PMIX || OMPI_USING_INTERNAL_PRRTE
+    char *pvar;
+#endif
     char **pargs = NULL;
     char *pfx = NULL;
     int m, param_len;