Makefile: do not overwritte LDFLAGS with null value
x86: handle 16bit segment bound for JMP. bug reported by Pancake & Anton Kochkov
MSVC added some code picked up by MingW, so cross-win32/74 compile is broken. this fixes the issue
merge next branch
rename static library extension to .lib for cross-windows building
Makefile: clean target should delete libs created by all ways of building