Fix PPL library patch during build.

Author: davexparker

prism/ext/ppl/Makefile

@@ -64,7 +64,7 @@ rpath:
 	  patchelf --set-soname "libppl.so.15" ../../$(PRISM_LIB_DIR)/libppl.so.15; \
 	  patchelf --set-soname "libppl_java.so" ../../$(PRISM_LIB_DIR)/libppl_java.so; \
 	  patchelf --set-rpath '$$ORIGIN' ../../$(PRISM_LIB_DIR)/libppl_java.so; \
-	  patchelf --replace-needed "libppl.so.15" "libppl.15.so" ../../$(PRISM_LIB_DIR)/libppl_java.so; \
+	  patchelf --replace-needed "libppl.so.15" "libppl.so.15" ../../$(PRISM_LIB_DIR)/libppl_java.so; \
 	fi
 # 	@if [ $(OSTYPE) = "darwin" ]; then \
 # 	  otool -L ../../$(PRISM_LIB_DIR)/libppl*dylib; \