prepare to enable build with ICU 56

Accept new UBlockCode enum values.
Just make it compile, without adding resource strings and blocks.
Excerpt of 5b7e8efb

Change-Id: Ia14e4c1c85f8be3e7bae0eb6f5bec1ae33f1a0bf
Reviewed-on: https://gerrit.libreoffice.org/19632Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Michael Stahl <mstahl@redhat.com>
(cherry picked from commit 4df5049c)

svx/source/dialog/charmap.cxx

@@ -1574,6 +1574,32 @@ void SubsetMap::InitList()
                     aAllSubsets.push_back( Subset( 0x118A0, 0x118FF, RID_SUBSETSTR_WARANG_CITI ) );
                     break;
 #endif
+#if U_ICU_VERSION_MAJOR_NUM >= 56
+                    /* FIXME: add RID_... to include/svx/ucsubset.hrc and
+                     * strings to svx/source/dialog/ucsubset.src and Unicode
+                     * block ranges to aAllSubsets, for now this only
+                     * compiles.. */
+                case UBLOCK_AHOM:
+                    break;
+                case UBLOCK_ANATOLIAN_HIEROGLYPHS:
+                    break;
+                case UBLOCK_CHEROKEE_SUPPLEMENT:
+                    break;
+                case UBLOCK_CJK_UNIFIED_IDEOGRAPHS_EXTENSION_E:
+                    break;
+                case UBLOCK_EARLY_DYNASTIC_CUNEIFORM:
+                    break;
+                case UBLOCK_HATRAN:
+                    break;
+                case UBLOCK_MULTANI:
+                    break;
+                case UBLOCK_OLD_HUNGARIAN:
+                    break;
+                case UBLOCK_SUPPLEMENTAL_SYMBOLS_AND_PICTOGRAPHS:
+                    break;
+                case UBLOCK_SUTTON_SIGNWRITING:
+                    break;
+#endif
 
             }