Build Tor for armv6

Raspberry Pi v1 etc.

Related to briar#1854.
2 jobs for armv6 in 82 minutes and 12 seconds (queued for 81 minutes and 7 seconds)
Name Stage Failure
test_build Test
  CC       src/test/src_test_test-test_dos.o
CC src/test/src_test_test-test_entryconn.o
CC src/test/src_test_test-test_entrynodes.o
CC src/test/src_test_test-test_geoip.o
CC src/test/src_test_test-test_guardfraction.o
CC src/test/src_test_test-test_extorport.o
CC src/test/src_test_test-test_hs.o
CC src/test/src_test_test-test_hs_common.o
CC s
Job's log exceeded limit of 8388608 bytes.