Build: fix #346 unable to run jlink on linux

git-svn-id: https://svn.code.sf.net/p/davmail/code/trunk@3562 3d1905a2-6b24-0410-a738-b14d5a86fcbd

Author: mguessan

build.xml

@@ -405,6 +405,7 @@
                 <exclude name="lib/hamcrest-core-*.jar"/>
             </fileset>
         </zip>
+        <antcall target="download-jre"/>
         <antcall target="download-build-jre"/>
         <zip file="dist/davmail-${release-name}-windows-standalone.zip">
             <fileset dir="dist">
@@ -540,7 +541,7 @@
         <sonar/>
     </target>
 
-    <target name="download-jre">
+    <target name="download-jre" unless="is.windows">
         <get src="https://api.azul.com/zulu/download/community/v1.0/bundles/latest/binary/?jdk_version=15&amp;ext=zip&amp;os=windows&amp;arch=x86&amp;hw_bitness=64&amp;bundle_type=jre&amp;features=fx"
              dest="dist/jrefx.zip"
         />
@@ -550,7 +551,7 @@
         <delete file="dist/jrefx.zip"/>
     </target>
 
-    <target name="download-build-jre">
+    <target name="download-build-jre" if="is.windows">
         <mkdir dir="dist"/>
         <get src="https://api.azul.com/zulu/download/community/v1.0/bundles/latest/binary/?jdk_version=15&amp;ext=zip&amp;os=windows&amp;arch=x86&amp;hw_bitness=64&amp;bundle_type=jdk&amp;features=fx"
              dest="dist/jdkfx.zip"