THRIFT-5562: remove gradle wrapper and use installed gradle 6.9
Client: java
Patch: Jiayu Liu

This closes #2576
diff --git a/lib/java/Makefile.am b/lib/java/Makefile.am
index 65981ca..5f97680 100644
--- a/lib/java/Makefile.am
+++ b/lib/java/Makefile.am
@@ -20,13 +20,13 @@
 export CLASSPATH
 
 all-local:
-	./gradlew $(GRADLE_OPTS) assemble \
+	gradle $(GRADLE_OPTS) assemble \
 		-Prelease=true \
 		-Pthrift.version=$(PACKAGE_VERSION) \
 		--console=plain
 
 install-exec-hook:
-	./gradlew $(GRADLE_OPTS) install \
+	gradle $(GRADLE_OPTS) install \
 		-Prelease=true \
 		-Pinstall.path=$(DESTDIR)$(JAVA_PREFIX) \
 		-Pinstall.javadoc.path=$(DESTDIR)$(docdir)/java \
@@ -34,24 +34,24 @@
 		--console=plain
 
 clean-local:
-	./gradlew $(GRADLE_OPTS) clean --console=plain
+	gradle $(GRADLE_OPTS) clean --console=plain
 
 precross: $(THRIFT)
-	./gradlew $(GRADLE_OPTS) shadowJar \
+	gradle $(GRADLE_OPTS) shadowJar \
 		-Prelease=true \
 		-Pthrift.version=$(PACKAGE_VERSION) \
 		-Pthrift.compiler=$(THRIFT) \
 		--console=plain
 
 check-local: $(THRIFT)
-	./gradlew $(GRADLE_OPTS) test \
+	gradle $(GRADLE_OPTS) test \
 		-Prelease=true \
 		-Pthrift.version=$(PACKAGE_VERSION) \
 		-Pthrift.compiler=$(THRIFT) \
 		--console=plain
 
 maven-publish:
-	./gradlew $(GRADLE_OPTS) uploadArchives \
+	gradle $(GRADLE_OPTS) uploadArchives \
 		-Prelease=true \
 		-Pthrift.version=$(PACKAGE_VERSION) \
 		--console=plain
@@ -61,8 +61,6 @@
 	gradle.properties \
 	settings.gradle \
 	gradle \
-	gradlew \
-	gradlew.bat \
 	CMakeLists.txt \
 	coding_standards.md \
 	android \