gcc_3.4.4: fix the native build on ucslugc by using arm, not thumb

gcc_3.4.4: fix the native build on ucslugc by using arm, not thumb
For some reason a thumb built gcc 3.4.4 fails to produce functional
executables even when linked dynamically (i.e. even when next to none
of the code in the resultant executable comes from the compiler itself).
This requires further investigation (or maybe the csl gcc), this commit
changes the build to generate arm even on thumb systems as a temporary fix.