Make build-blitz target faster (Fix #8356)

Use hard-coded paths for the blitz.buildpath
variable in ant. This prevents rogue directories
(for example see the submodule work of omegh-104)
from being built. In this case, insight is not
touched at all:

{{{
  $ ./build.py build-blitz 2>&1 | tee build.log
  $ grep -i insight build.log # Nothing.
}}}

Note: in order to have tests working, it will
likely be necessary to run the full build.

build.xml

@@ -49,10 +49,18 @@ java component.
         </then></if>
         <installIvy/>
         <ivy:buildlist reference="all.buildpath" settingsRef="ivy.toplevel">
-            <fileset dir="${omero.home}/components" includes="*/build.xml" excludes="**/policy/**,**/tools/**"/>
+            <fileset dir="${omero.home}/components" includes="*/build.xml" excludes="**/tools/**"/>
         </ivy:buildlist>
         <ivy:buildlist reference="blitzserver.buildpath" settingsRef="ivy.toplevel">
-            <fileset dir="${omero.home}/components" includes="*/build.xml" excludes="**/policy/**,**/tools/**"/>
+            <fileset dir="${omero.home}/components/blitz/" includes="build.xml"/>
+            <fileset dir="${omero.home}/components/common/" includes="build.xml"/>
+            <fileset dir="${omero.home}/components/dsl/" includes="build.xml"/>
+            <fileset dir="${omero.home}/components/model/" includes="build.xml"/>
+            <fileset dir="${omero.home}/components/rendering/" includes="build.xml"/>
+            <fileset dir="${omero.home}/components/romio/" includes="build.xml"/>
+            <fileset dir="${omero.home}/components/server/" includes="build.xml"/>
+            <fileset dir="${omero.home}/components/specification/" includes="build.xml"/>
+            <fileset dir="${omero.home}/components/xsd-fu/" includes="build.xml"/>
         </ivy:buildlist>
         <ivy:buildlist reference="all-tools.buildpath" settingsRef="ivy.toplevel">
             <fileset dir="${omero.home}/components/tools" includes="*/build.xml"/>