makefiles: Get rid of the no longer used PO_SRCS variables.
makefiles: Automatically update the IDL_H_SRCS variable.
makefiles: Don't use Make.rules in the top-level Makefile.
makefiles: Generate individual .gitignore files corresponding to the build targets.
makefiles: Generate the top-level .gitignore from configure.
winebuild: Use correct PATH separator on Windows.
winebuild: Don't crash when dlltool or ar can't be found.
dbghelp: Constify some character strings.
msxml3: Store document url in properties so every instance could see it.
winealsa.drv: midiSeq must be protected by a critical section.
ntdll: Fixme once for NtFlushInstructionCache().