[PATCH] dbghelp: Use debuggee environment veriables in search_dll_path.

[Jacek Caban]

This fixes searching wow32 binaries, where debuggee search path is 
different than debugger's.

Signed-off-by: Jacek Caban <jacek(a)codeweavers.com>
---
  dlls/dbghelp/dbghelp.c         | 75 +++++++++++++++++++++++++++++++---
  dlls/dbghelp/dbghelp_private.h |  5 ++-
  dlls/dbghelp/elf_module.c      |  2 +-
  dlls/dbghelp/macho_module.c    |  2 +-
  dlls/dbghelp/path.c            | 18 ++++----
  dlls/dbghelp/pe_module.c       |  2 +-
  6 files changed, 86 insertions(+), 18 deletions(-)