Fix for bug 2283 (RVCT 4.0 support is missing from PDK 3.0.h) Have multiple extension sections in the bld.inf, one for each version of the compiler. The RVCT version building the tools will build the runtime libraries for its version, but make sure we extract all the other versions from zip archives. Also add the archive for RVCT4.

EXPORTS
	Read1 @ 1 NONAME
	Read2 @ 2 NONAME
	Read3 @ 3 NONAME
	Read4 @ 4 NONAME
	Read5 @ 5 NONAME
	Read6 @ 6 NONAME
	Read7 @ 7 NONAME
	Read8 @ 8 NONAME
	Read9 @ 9 NONAME
	GetDataAddress @ 10 NONAME
	GetSizeOfData @ 11 NONAME