change library output folder and make it configurable

bindings/java/Makefile

@@ -1,5 +1,7 @@
 INCLUDE_DIRS = ../../src ../../blst/bindings
 
+LIBRARY_FOLDER=src/main/resources/ethereum/ckzg4844/lib
+
 ifeq ($(OS),Windows_NT)
 	CLANG_EXECUTABLE=clang
 	GRADLE_COMMAND=gradlew
@@ -32,7 +34,8 @@ endif
 all: build test
 
 build:
-	${CLANG_EXECUTABLE} ${CLANG_FLAGS} -O -Wall ${addprefix -I,${INCLUDE_DIRS}} -I"${JAVA_HOME}/include" -I"${JAVA_HOME}/include/${JNI_INCLUDE_FOLDER}" -o src/main/resources/lib/${LIBRARY_RESOURCE} c_kzg_4844_jni.c c_kzg_4844.o ../../lib/libblst.a
+	mkdir -p ${LIBRARY_FOLDER}
+	${CLANG_EXECUTABLE} ${CLANG_FLAGS} -O -Wall ${addprefix -I,${INCLUDE_DIRS}} -I"${JAVA_HOME}/include" -I"${JAVA_HOME}/include/${JNI_INCLUDE_FOLDER}" -o ${LIBRARY_FOLDER}/${LIBRARY_RESOURCE} c_kzg_4844_jni.c c_kzg_4844.o ../../lib/libblst.a
 
 test:
 	${GRADLE_COMMAND} clean test

bindings/java/src/main/java/ethereum/ckzg4844/CKzg4844JNI.java

@@ -12,9 +12,8 @@ public class CKzg4844JNI {
   private static final String PLATFORM_NATIVE_LIBRARY_NAME = System.mapLibraryName(LIBRARY_NAME);
 
   static {
-    InputStream libraryResource = Thread.currentThread().getContextClassLoader()
-        .getResourceAsStream(
-            "lib/" + PLATFORM_NATIVE_LIBRARY_NAME);
+    InputStream libraryResource = CKzg4844JNI.class.getResourceAsStream(
+        "lib/" + PLATFORM_NATIVE_LIBRARY_NAME);
     if (libraryResource == null) {
       try {
         System.loadLibrary(LIBRARY_NAME);