Update pxtarget.json to GHI codal-brainpad repo about pxt-brainpad HOT 8 CLOSED

600 -DMBED_CONF_PLATFORM_STDIO_FLUSH_AT_EXIT=1 -DMBED_CONF_PLATFORM_STDIO_CONVERT_NEWLINES=0 -DUSB_STM_HAL -DUSBHOST_OTHER -MMD -MT CMakeFiles/BRAINPAD.dir/pxtapp/base/pxt.cpp.obj -MF CMakeFiles\BRAINPAD.dir\pxtapp\base\pxt.cpp.obj.d -o CMakeFiles/BRAINPAD.dir/pxtapp/base/pxt.cpp.obj -c ../pxtapp/base/pxt.cpp
../pxtapp/base/pxt.cpp:184:1: error: 'ramint_t' does not name a type
 ramint_t Segment::growthFactor(ramint_t size) {
 ^
../pxtapp/base/pxt.cpp:201:25: error: variable or field 'growByMin' declared void
 void Segment::growByMin(ramint_t minSize) {
                         ^
../pxtapp/base/pxt.cpp:201:25: error: 'ramint_t' was not declared in this scope
../pxtapp/base/pxt.cpp:205:22: error: variable or field 'growBy' declared void
 void Segment::growBy(ramint_t newSize) {
                      ^
../pxtapp/base/pxt.cpp:205:22: error: 'ramint_t' was not declared in this scope
../pxtapp/base/pxt.cpp:579:1: error: expected '}' at end of input
 } // namespace pxt
 ^
[6/85] Building CXX object CMakeFiles/BRAINPAD.dir/pxtapp/display/display.cpp.obj
ninja: build stopped: subcommand failed.
INTERNAL ERROR: Error: Exit code: 1 from cd built/codal; python build.py
    at ChildProcess.<anonymous> (C:\gh\pxt\built\nodeutil.js:84:24)
    at emitTwo (events.js:126:13)
    at ChildProcess.emit (events.js:214:7)
    at maybeClose (internal/child_process.js:925:16)
    at Process.ChildProcess._handle.onexit (internal/child_process.js:209:5)