build, data: the Greek capitals by name; one way to run python3; bench.sh checks its own binary

Δ Γ Λ Ω Φ Ψ Σ Θ answered only to De, Ga, La, Om, Ph, Ps, Si, Th, while
their small letters answered to delta, gamma and the rest; they answer to
the names too now.  mkemoji and cldr2emoji write UTF-8 whatever the
locale, as the other generators already did; verify-map calls python3 the
one way; the tests' include path drops a directory nothing includes
through; and bench.sh says which binary is missing instead of blaming the
daemon ten seconds later.

Makefile

@@ -89,12 +89,12 @@ test: check
 verify-map:
 	test "$$(cut -f1 map/hira.map)" = "$$(cut -f1 map/kata.map)"
 	python3 map/mktelex.py | cmp - map/telex.map
-	python3 -B map/mkemoji | cmp - map/emoji.dict
-	python3 -B map/mkhanja | cmp - map/hanja.dict
-	python3 -B map/verifymap.py map/*.map map/*.dict
-	python3 -B tests/mkemoji_test.py
-	python3 -B tests/mkhanja_test.py
-	python3 -B tests/skk2ktrans_test.py
+	python3 map/mkemoji | cmp - map/emoji.dict
+	python3 map/mkhanja | cmp - map/hanja.dict
+	python3 map/verifymap.py map/*.map map/*.dict
+	python3 tests/mkemoji_test.py
+	python3 tests/mkhanja_test.py
+	python3 tests/skk2ktrans_test.py
 
 .PHONY: all check check-live check-stress test verify-map clean gtk bench \
 	docker docker-image docker-build docker-check docker-check-live \