update main build comments/docs

git-svn-id: http://dev.corsaair.com/svn/redtamarin/trunk@1677 8266667d-5eeb-4550-8638-74b212e0aa7d

build.xml

@@ -202,27 +202,24 @@
         <if>
             <equals arg1="${SDK_OS}" arg2="windows"/>
         <then>
-
-            <!-- <echo message="found Windows"/> -->
+            <!-- special case for Windows, 'python' will not work under Cygwin,
+                 we need the real exe eg. 'python2.7.exe' -->
+
             <exec executable="which" outputProperty="winpython_path" failonerror="false">
                 <arg line="python" />
             </exec>
-            <!-- <echo message="python which = ${winpython_path}"/> -->
-
             <exec executable="realpath" outputProperty="winpython_realpath" failonerror="false">
                 <arg line="${winpython_path}" />
             </exec>
-            <!-- <echo message="python realpath = ${winpython_realpath}"/> -->
-
             <exec executable="basename" outputProperty="winpython_base" failonerror="false">
                 <arg line="${winpython_realpath}" />
             </exec>
-            <!-- <echo message="python base = ${winpython_base}"/> -->
 
             <property name="PYTHON_EXE" value="${winpython_base}"/>
 
         </then>
         <else>
+            <!-- for Linux / Mac OS X we can use 'python' as usual -->
             <property name="PYTHON_EXE" value="python"/>
         </else>
         </if>