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.

map/emoji.dict

@@ -52,7 +52,7 @@ beta	β
 chi	χ
 deg	° 🪯
 degree	°
-delta	δ
+delta	δ Δ
 de	Δ 🪅
 dn	↓
 down	↓ 🫳 👇 👎 🐨 📩 📉 ⬇️ ⤵️ 🔽 ⏬ 🔻
@@ -60,7 +60,7 @@ _e	ₑ
 eps	ε
 eta	η
 fuck	凸
-gamma	γ
+gamma	γ Γ
 ga	Γ
 ^i	ⁱ
 ii	∫
@@ -69,34 +69,34 @@ inf	∞
 infinity	∞ ♾️
 iota	ι
 kappa	κ
-lambda	λ
+lambda	λ Λ
 la	Λ
 mul	×
 times	×
 mu	μ
 ^n	ⁿ
 nu	ν
-omega	ω
+omega	ω Ω
 om	Ω 🕉️
 oo	●
 circle	● 🛞 ⏺️ ⭕ Ⓜ️ 🔴 🟠 🟡 🟢 🔵 🟣 🟤 ⚫ ⚪
 _o	ₒ
-phi	φ
+phi	φ Φ
 ph	Φ
 pi	π Π 👲
 pp	∏
 prod	∏
-psi	ψ
+psi	ψ Ψ
 ps	Ψ
 rho	ρ
-sigma	σ
+sigma	σ Σ
 si	Σ
 sq	√
 sqrt	√
 ss	∑
 sum	∑
 tau	τ
-theta	θ
+theta	θ Θ
 th	Θ
 up	↑ 🤮 🫳 👆 ☝️ 👍 🤲 🧗 🧗‍♂️ 🧗‍♀️ 🍳 🧣 🧥 📄 📈 ⬆️ ⤴️ 🔝 🔼 ⏫ 🆙 🔺
 ups	υ