pkg(kotlin-1.4.31): use jdk8 with kotlin (#256)

packages/kotlin/1.4.31/build.sh

@@ -1,10 +1,13 @@
 #!/usr/bin/env bash
 
-source ../../java/15.0.2/build.sh
+# Download and extract JDK8
+curl -L "https://github.com/AdoptOpenJDK/openjdk8-binaries/releases/download/jdk8u292-b10/OpenJDK8U-jdk_x64_linux_hotspot_8u292b10.tar.gz" -o jdk.tar.gz
+tar xzf jdk.tar.gz --strip-components=1
+rm jdk.tar.gz
 
+# Download and extract Kotlin
 curl -L "https://github.com/JetBrains/kotlin/releases/download/v1.4.31/kotlin-compiler-1.4.31.zip" -o kotlin.zip
 unzip kotlin.zip
 rm kotlin.zip
-
 cp -r kotlinc/* .
 rm -rf kotlinc

packages/kotlin/1.4.31/compile

@@ -1,7 +1,6 @@
 #!/usr/bin/env bash
 
-# Put instructions to compile source code, remove this file if the language does not require this stage
-
 rename 's/$/\.kt/' "$@" # Add .kt extension
 
-kotlinc *.kt -include-runtime -d code.jar
+# Compile Kotlin code to a jar file
+kotlinc *.kt -include-runtime -d code.jar

packages/kotlin/1.4.31/environment

@@ -1,4 +1,4 @@
 #!/usr/bin/env bash
 
-# Put 'export' statements here for environment variables
+# Add java and kotlinc to path
 export PATH=$PWD/bin:$PATH

packages/kotlin/1.4.31/run

@@ -1,4 +1,4 @@
 #!/usr/bin/env bash
 
-# Put instructions to run the runtime
-java -jar code.jar
+# Run jar file
+java -jar code.jar

packages/kotlin/1.4.31/test.kt

@@ -1,3 +1,3 @@
 fun main() {
     println("OK")
-}
+}