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.

!COMPULSORY
!INCREMENTAL

<option keepgoing>
<option tools>
<option epoconly>

e32tools	e32tools\group
e32			e32
compsupp	e32\compsupp
f32			f32\group
hal			hal