run haveno_deps script on gradle build instead of from make (#230)

Closes #184

Maybe it would be "nicer" to download the binaries with a gradle task utilising gradle tasks' inputs and outputs but that's for someone more skilled with gradle

Makefile

@@ -1,6 +1,6 @@
 # See docs/installing.md
 
-build: nodes localnet haveno
+build: localnet haveno
 
 clean:
 	./gradlew clean
@@ -11,9 +11,6 @@ clean-localnet:
 localnet:
 	mkdir -p .localnet
 
-nodes: localnet
-	./scripts/haveno_deps.sh
-
 haveno:
 	./gradlew build
 

build.gradle

@@ -363,6 +363,13 @@ configure(project(':core')) {
     test {
         systemProperty 'jdk.attach.allowAttachSelf', true
     }
+
+    task havenoDeps(type: Exec) {
+        workingDir '..'
+        commandLine './scripts/haveno_deps.sh'
+    }
+    if (osdetector.os != 'windows') processResources.dependsOn havenoDeps // before both test and build
+    else println "Haveno dependencies must be downloaded manually on Windows"
 }
 
 configure(project(':cli')) {