changed permissions of "env" file

The previous permission of the  <activemq-install-dir>/bin/env file
(755) caused some problems on systems where the
<activemq-install-dir>/bin/ directory is part of the PATH variable.
The executable "env" is also available of all common unix platforms.
If <activemq-install-dir>/bin/ has precedence in the PATH environment
variable this causes lots of unexpected problems.
In future it would be a good idea to relocate the file to the
<activemq-install-dir>/conf directory.

assembly/src/main/descriptors/unix-bin.xml

@@ -96,7 +96,6 @@
       <outputDirectory>/</outputDirectory>
       <includes>
         <include>bin/activemq</include>
-        <include>bin/env</include>
         <include>bin/diag</include>
         <include>bin/activemq-admin</include>
         <include>bin/macosx/activemq</include>
@@ -107,6 +106,19 @@
       <lineEnding>unix</lineEnding>
     </fileSet>
 
+    <!-- Copy over the unix-script configuration file that need unix line endings and also chmod to 644 -->
+    <fileSet>
+      <directory>src/release</directory>
+      <outputDirectory>/</outputDirectory>
+      <includes>
+        <include>bin/env</include>
+      </includes>
+      <directoryMode>0755</directoryMode>
+      <fileMode>0644</fileMode>
+      <lineEnding>unix</lineEnding>
+    </fileSet>
+
+
     <!-- Copy over example scripts that need unix line endings and also chmod to 755 -->
     <fileSet>
       <directory>src/release</directory>