Add spring-build 2.2.3 and ensure build succeeds.

spring-build was previously included via an svn:external. Adding
directly to the source tree under Git to avoid the need for a git
submodule.

In order to build from any earlier commit, it is recommended to
export spring-build or symlink an existing copy into the root
of the spring-framework project and then build normally.

$ svn export https://src.springsource.org/svn/spring-build/tags/project-build-2.2.3 spring-build

spring-build/war/common.xml

@@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project name="common-war" xmlns:s="antlib:org.springframework.build">
+
+	<import file="../common/common.xml"/>
+
+<!-- Macros -->
+	<macrodef name="do-compile">
+		<attribute name="classpath.id"/>
+		<attribute name="input.dir"/>
+		<attribute name="output.dir"/>
+		<attribute name="resources.dir"/>
+		<sequential>
+			<s:javac destdir="@{output.dir}" source="${source.version}" target="${target.version}"
+					debug="${compile.debug}" debugLevel="${compile.debug.level}">
+				<compilerarg line="${compiler.args}"/>
+				<src path="@{input.dir}"/>
+				<include name="**/*.java"/>
+				<include name="*.java"/>
+				<classpath refid="@{classpath.id}"/>
+			</s:javac>
+			<copy todir="@{output.dir}">
+				<fileset dir="@{input.dir}">
+					<exclude name="**/*.java"/>
+					<exclude name="*.java"/>
+				</fileset>
+			</copy>
+			<copy todir="@{output.dir}">
+				<fileset dir="@{resources.dir}"/>
+			</copy>
+		</sequential>
+	</macrodef>
+
+</project>