i#840: Replace uses of WCHAR with TCHAR in dr_config.c
i#840: Replace uses of WCHAR with TCHAR in dr_config.c

Part 2 of porting drconfiglib to Linux.

This change was relatively mechanical.

Review URL: https://codereview.appspot.com/6498082

git-svn-id: ed337ca7cdb08c0ba29d8fe58632bb7686892c2d@1579 49cc7528-f6fd-11dd-9d1a-b59b2e1864b6

rnk/dynamorio,rnk/dynamorio,rnk/dynamorio,rnk/dynamorio,rnk/dynamorio