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
	_ZN6DPTest10FlushCacheEv @ 1 NONAME
	_ZN6DPTest12SetCacheSizeEjj @ 2 NONAME
	_ZN6DPTest9CacheSizeERjS0_S0_ @ 3 NONAME
	_ZN6DPTest9EventInfoER5TDes8 @ 4 NONAME
	_ZN6DPTest10AttributesEv @ 5 NONAME