Bring back OS/2 support. Reverses r758929 with a little bit of conflict resolution.

remove OS/2 platform support

remove BeOS OS support

Bring in basic support for building the winnt MPM under mingw32, using the autoconf build system. Currently this will get you to the point of linking errors on gen_test_char. configure.in: Default to winnt MPM on mingw32 hosts. configure.in: Add AP_DECLARE_EXPORT for mingw32 hsots. os/config.m4: Use win32 dir under mingw32. os/win32/Makefile.in: Add in a new makefile to generate libos on win32. server/mpm/config.m4: Add winnt MPM to the help string. server/mpm/config.m4: winnt MPM is a threaded MPM. server/mpm/winnt/child.c: SO_UPDATE_ACCEPT_CONTEXT is defined under a different header in mingw32. server/mpm/winnt/{Makefile.in,config.m4}: Base build for winnt MPM. os/win32,server/mpm/winnt: Update svn:ignore for .deps/.libs

The current config.guess in APR outputs i386-pc-os2-emx on OS/2 rather than i386-pc-os2_emx (dash instead of underscore), adjust the tests to match.

Move the few BS2000 specific in unixd.c

To be on the safe side...

* configure.in: added Cygwin specific APR_SETVARs. * os/config.m4: added Cygwin specific values for $OS and $OS_DIR. $OS_DIR will change to "cygwin" as soon as I get the DSO/DLL things clean as with 1.3.20. * support/logresolve.c: added OS specific #ifdef statement to define h_errno as extern __declspec(dllimport); it's imported from the cygwin1.dll itself. Submitted by: Stipe Tolj <tolj@wapme-systems.de>

Use the autoconf variable "host" consistently for platform checks.

Libtool takes care of the lib prefix so get rid of our own workaround.

Prepare our autoconf setup for autoconf 2.14a and for cross-compiling PR: 6379 Submitted by: "R�diger" Kuhlmann <Tadu@gmx.de> Reviewed by: Ryan Bloom

Add VPATH support to Apache: os/$(OS_DIR) is now equivalent to the old $(OS_DIR) Necessary include paths are added only in VPATH mode. Dependencies are stored in the build directory now. They contain paths which depend on the current build, and therefore they are not general. Fixed two dependencies in main/Makefile.in.

Fix minor configuration & platform dependencies

Under OS/2 (well actually EMX gcc) libraries don't have a 'lib' prefix. In main code libtool handles it. This deals with APR.

Enable dynamic module support on Linux. This should work on any LIBTOOL based system, but YMMV.

Get OS/2 working with new configure system. Yay! :)

Make OS selection work for non-UNIX cases

These changes are committed together, because they depend on each other. - shared modules can be built in the tree - added support for --with-layout, uses APACI's config.layout - working 'make install' - working 'make depend' - working Pthreads checks - buildconf replaced

The second part of the big autoconf patch, which actually adds autoconf building to the tree.