Invalid exit status: foreign.test.sh on Arm

[3b]

run-tests.sh foreign.test.sh fails on arm:

building foreign-test.so
/ cc -shared foreign-test.c -o foreign-test.so
/usr/bin/ld: /tmp/ccO5FDj7.o: relocation R_ARM_THM_MOVW_ABS_NC against `numberish' can not be used when making a shared object; recompile with -fPIC
/tmp/ccO5FDj7.o: error adding symbols: Bad value

adding
                 Linux-ARM) new=-fPIC ;;
to run-compiler.sh with the other platforms lets it finish successfully

[3b (00003b)]

similar failure in foreign-stack-alignment.impure.lisp, also fixed by that addition to run-compiler.sh

[Stas Boukarev (stassats)]

In ba986de413822f1a6edf4804274f2b8b1c166551.