Fix build failure on windows (#1498)

Fixes #1497

Signed-off-by: Snjezana Peco <[email protected]>

org.eclipse.jdt.ls.core/pom.xml

@@ -48,9 +48,10 @@
 
 								def versionUrl = new URL("https://services.gradle.org/versions/all")
 								def versionStr = versionUrl.text;
-								def versionsFile = new File("${basedir}/gradle/checksums/versions.json")
+								def versionsFile = new File(project.basedir.absolutePath, "gradle/checksums/versions.json")
 								versionsFile.parentFile.mkdirs() //just in case
 								versionsFile.write(versionStr)
+								println "Wrote to ${versionsFile}"
 
 								def versions = new JsonSlurper().parseText(versionStr);
 								class Checksum { String wrapperChecksumUrl; String sha256 }
@@ -70,8 +71,9 @@
 									}
 								}
 								def json = JsonOutput.toJson(checksums)
-								def checksumsFile = new File("${basedir}/gradle/checksums/checksums.json")
+								def checksumsFile = new File(project.basedir.absolutePath, "gradle/checksums/checksums.json")
 								checksumsFile.write(JsonOutput.prettyPrint(json))
+								println "Wrote to ${checksumsFile}"
 							</source>
 						</configuration>
 					</execution>