tdf#92483 fix initializing JRE on Win 64bit (load java's msvcr100.dll)

problem is that the offsets/sizes are of different type than ptrdiff_t,
and when using without casting, the resulting address is way off...

Change-Id: I7b1cdd611c8c4b317cd33ca8fbbda2e7e8f5f4fc
Reviewed-on: https://gerrit.libreoffice.org/16938Reviewed-by: David Ostrovsky <david@ostrovsky.org>
Tested-by: Jenkins <ci@libreoffice.org>

jvmfwk/plugins/sunmajor/pluginlib/sunjavaplugin.cxx

@@ -588,7 +588,7 @@ static void do_msvcr_magic(rtl_uString *jvm_dll)
         if (sections->VirtualAddress <= importsVA &&
             importsVA < sections->VirtualAddress + sections->SizeOfRawData)
         {
-            VAtoPhys = sections->PointerToRawData - sections->VirtualAddress;
+            VAtoPhys = static_cast<size_t>(sections->PointerToRawData) - static_cast<size_t>(sections->VirtualAddress);
             break;
         }
         ++sections;