Bring back OS/2 support. Reverses r758929 with a little bit of conflict resolution.
remove OS/2 platform support
Fix linking of OS/2 core after recent changes that took apr/apr-util out of EXTRA_LIBS. Use AP_LIBS to get all required libraries.
OS/2: Use full set of linker flags when linking shared core loader EXE.
OS/2: set a decent size stack. Default is only 32k which runs out in some configurations.
Switch to using aplibtool for building under OS/2 & add support for building loadable modules as OS/2 DLLs. PR: Obtained from: Submitted by: Reviewed by: