Only sign JAR when it is built


git-svn-id: svn://svn.code.sf.net/p/tigervnc/code/trunk@4703 3789f03b-4d11-0410-bbf8-ca57d06f2519
diff --git a/cmake/SignJar.cmake b/cmake/SignJar.cmake
index 3b0d0c8..abc35ba 100644
--- a/cmake/SignJar.cmake
+++ b/cmake/SignJar.cmake
@@ -6,6 +6,8 @@
   message(FATAL_ERROR "JAR_FILE must be defined")
 endif()
 
+message(STATUS "Signing ${JAR_FILE}")
+
 set(KEYTOOL "${Java_PATH}/keytool")
 set(JARSIGNER "${Java_PATH}/jarsigner")