- removed the only statement to comply with sun compiler

git-svn-id: https://ppm.inf.ethz.ch/svn/ppmnumerics/branches/ngtopo/libppmnumerics@590 7c7fe9aa-52eb-4d9e-b0a8-ba7d787348e9

src/ppm_comp_pp_ring.f

@@ -68,7 +68,7 @@
       USE ppm_module_substop
       USE ppm_module_error
       USE ppm_module_alloc
-      USE ppm_module_map, ONLY : ppm_module_map_part_ring_shift
+      USE ppm_module_map
       USE ppm_module_comp_pp_doring
       IMPLICIT NONE
 #if   __KIND == __SINGLE_PRECISION | __KIND == __SINGLE_PRECISION_COMPLEX