[patch]: Unify and cleanup entry point handling for PE targets

[Kai Tietz <Kai dot Tietz at onevision dot com>]

Hello all,

this patch takes care that PE-coff targets are automatically using 
DllMainCRTStartup entry point for --shared and/or --dll option. Also it 
cleans up with the use of ENTRY in pe.em, pep.em, and its related 
shell-scripts in emulparams.

2009-10-28  Kai Tietz  <kai.tietz@onevision.com>

        * emulparams/arm_epoc_pe.sh: Remove ENTRY.
        * emulparams/arm_wince_pe.sh: Likewise.
        * emulparams/i386pe.sh: Likewise.
        * emulparams/i386pe_posix.sh: Likewise.
        * emulparams/mcorepe.sh: Likewise.
        * emulparams/mipspe.sh: Likewise.
        * emulparams/ppcpe.sh: Likewise.
        * emulparams/armpe.sh: Likewise.
        * emulparams/i386pep.sh: Likewise.
        * emulparams/shpe.sh: Likewise.
        Additional cleaned up with double defined
        variables for SUBSYSTEM and INITIAL_SYMBOL_CHAR.
        * emultempl/pe.em: Remove use of ENTRY.
        (is_linked_dll): New local variable.
        (pe_subsystem): New local variable.
        (gld_XXX_before_parse): Don't set here default
        entry point.
        (set_entry_point): New function to set entry
        point.
        (set_pe_subsystem): Remove code for entry point.
        (gld_XXX_handle_option): Set for OPTION_DLL value
        is_linked_dll to true.
        (gld_XXX_after_parse):Use here set_entry_point.
        * emultempl/pep.em: Likewise.

This patch is tested for i686-pc-mingw32, and x86_64-pc-mingw32, 
i686-pc-cygwin. For the bfd targets arm-epoc-pe, arm-wince-pe, 
i686pe-posix, mips-pe, ppc-pe, arm-pe, sh-pe, and mcore-pe just cross 
toolchain tests were done by me. All tests didn't produced any new 
failures. Is this patch ok for apply?

Cheers,
Kai

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