Pull request #254: Fix RE build

Merge in LCL/wolframclientforpython from hotfix/RE-517869 to master

* commit '0289b05ae138a19afbf2d2fb1b556aa01060db34':
  Prepend virtualenv path to $PATH.
  python -> ${python.exe}

Author: Bobby Hoggard

scripts/re_build_WolframClient.xml

@@ -73,7 +73,7 @@
 	<target name='Installer.WolframClientForPython.execute' extensionOf='Deploy.execute'>
 
 		<!-- Ensure all necessary modules are installed -->
-		<exec executable="python">
+		<exec executable="${python.exe}">
 			<arg value="-m" />
 			<arg value="pip" />
 			<arg value="install" />
@@ -84,7 +84,7 @@
 		</exec>
 
 		<!-- Run setup script -->
-		<exec executable="python">
+		<exec executable="${python.exe}">
 			<arg value="setup.py" />
 			<arg value="sdist" />
 			<arg value="bdist_wheel" />
@@ -113,7 +113,7 @@
 	<target name='Web.WolframClientForPython.execute.custom' extensionOf='Web.execute.custom'>
 
 		<!-- Create a virtual environment to build docs in -->
-		<exec executable="python3.6">
+		<exec executable="${python.exe}">
 			<arg value="-m" />
 			<arg value="venv" />
 			<arg value="${tmp_directory}/venv" />
@@ -134,7 +134,7 @@
 		<exec dir= "${basedir}/docs" executable="build_docs.sh">
 			<arg value="-b" />
 			<arg value="${files_directory}" />
-			<env key="PATH" path="${env.PATH}:${tmp_directory}/venv/bin"/>
+			<env key="PATH" path="${tmp_directory}/venv/bin:${env.PATH}"/>
 		</exec>
 
 	</target>
@@ -167,4 +167,4 @@
 		</exec>
 	</target>
 
-</project>
+</project>