judge: bring back vj4 support

packages/hydrojudge/langs.yaml

@@ -0,0 +1,28 @@
+c:
+    compile: /usr/bin/gcc -O2 -Wall -std=c99 -o foo foo.c -lm
+cc:
+    compile: /usr/bin/g++ -O2 -Wall -std=c++11 -o foo foo.cc -lm
+pas:
+    compile: /usr/bin/fpc -O2 -ofoo foo.pas
+java:
+    compile: /usr/bin/javac -d /w -encoding UTF-8 Main.java
+    code_file: Main.java
+    execute: /usr/bin/java -Dfile.encoding=UTF-8 Main
+py3:
+    compile: /usr/bin/python3 -c "import py_compile; py_compile.compile('/w/foo.py', '/w/foo.pyc', doraise=True)"
+    execute: /usr/bin/python3 foo.pyc
+php:
+    execute: /usr/bin/php foo.php
+rs:
+    compile: /usr/bin/rustc -O -o /w/foo /w/foo.rs
+hs:
+    compile: /usr/bin/ghc -O -outputdir /tmp -o /w/foo /w/foo.hs
+js:
+    execute: /usr/bin/jsc foo.js
+go:
+    compile: /usr/bin/go build -o /w/foo /w/foo.go
+rb:
+    execute: /usr/bin/ruby foo.rb
+cs:
+    compile: /usr/bin/mcs csc -optimize+ -out:/w/foo.exe /w/foo.cs
+    execute: /usr/bin/mono foo.exe