HBASE-21135 Build fails on windows as it fails to parse windows path during license check

Signed-off-by: Mike Drob <mdrob@apache.org>
Signed-off-by: Sean Busbey <busbey@apache.org>

pom.xml

@@ -1027,6 +1027,26 @@
           </execution>
         </executions>
       </plugin>
+      <!-- sets where to find the generated LICENSE files -->
+      <plugin>
+        <groupId>org.codehaus.mojo</groupId>
+        <artifactId>build-helper-maven-plugin</artifactId>
+        <executions>
+          <execution>
+            <id>create-license-file-path-property</id>
+            <goals>
+              <goal>regex-property</goal>
+            </goals>
+            <configuration>
+              <name>license.aggregate.path</name>
+              <value>${project.build.directory}/maven-shared-archive-resources/META-INF/LICENSE</value>
+              <regex>\\</regex>
+              <replacement>/</replacement>
+              <failIfNoMatch>false</failIfNoMatch>
+            </configuration>
+          </execution>
+        </executions>
+      </plugin>
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-enforcer-plugin</artifactId>
@@ -1468,10 +1488,6 @@
     <license.bundles.bootstrap>false</license.bundles.bootstrap>
     <!-- modules that include jquery in their source tree should set true -->
     <license.bundles.jquery>false</license.bundles.jquery>
-    <!-- where to find the generated LICENSE files -->
-    <license.aggregate.path>
-      ${project.build.directory}/maven-shared-archive-resources/META-INF/LICENSE
-    </license.aggregate.path>
     <tar.name>${project.build.finalName}.tar.gz</tar.name>
     <maven.build.timestamp.format>
       yyyy-MM-dd'T'HH:mm