Fixed typo in Windows zipup batch files
remove dependency on external program "rm"
Merge pull request #122 from ArmstrongJ/zipup-batch-fix

Fixed typo in Windows zipup batch files
do owconfig.vbs more up-to-date
Modified BUILD.md to clarify how to use builder to copy the system to rel after doing a full build.
correct mistake in DOSEMU batch file, prevent remapping of e: drive which is used by DOSEMU default mapping
pass buffer len for better length control
add missing export for SHGetFolderPathx functions from shel32.dll
use signed radix for output formatting
 negative value output requested radix prefix always
 positive value output radix prefix only if requested radix differs from current
minimize scope for picking macros
fix dosemu drive mapping in batch file for wgml project
suppress confusing message "Could not find ...\open-watcom-v2\bld\wmake\binbuild\*.obj" during bootstrap build for MS nmake
remove next environment variable which was not used for while (nobody asked for default windowing support on NT or OS/2, because there is console mode)
correct prototype
source code formating change
Add OWTOOLS environment variable to setvars script to identify bootstrap compiler for OW build system, because OW build system is not able determine which toolchain is used.
OWUSENATIVETOOLS variable is removed because it is useles now.
Change appropriate make file to use this variable to switch compiler options for appropriate toolchain
supproted values are
WATCOM   - use Open Watcom for bootstrap build (define __WATCOM__ macro )
VISUALC  - use Microsoft Visual C++ for bootstrap build (define __MSVC__ macro )
GCC      - use GNU gcc compiler for bootstrap buil (define __GCC__ macro )
CLANG    - use Clang compiler for bootstrap build (define __CLANG__ macro )
INTEL    - use Intel C++ compiler for bootstrap build (define __INTEL__ macro )
if it is not defined or unsupprted value is used then default to WATCOM