wineandroid: Generate assets checksum from the gradle build file.

dlls/wineandroid.drv/Makefile.in

@@ -20,9 +20,5 @@ EXTRA_TARGETS = wine-debug.apk
 all: wine-debug.apk
 
 wine-debug.apk: build.gradle $(srcdir)/AndroidManifest.xml $(srcdir)/WineActivity.java $(srcdir)/wine.svg
-	(test -d assets && \
-	  rm -f assets/files.sum assets/sums.sum && \
-	  sha256sum `find assets -type f -print` | sed 's/ assets\// /' >files.sum && \
-	  sha256sum files.sum >sums.sum && \
-	  mv files.sum sums.sum assets) || rm -rf assets
-	gradle -q assembleDebug && mv build/outputs/apk/wine-debug.apk .
+	gradle -q assembleDebug
+	mv build/outputs/apk/wine-debug.apk $@

dlls/wineandroid.drv/build.gradle.in

@@ -32,7 +32,8 @@ buildscript
     }
 }
 
-def add_icon_task( dir, scale ) {
+def add_icon_task( dir, scale )
+{
     return tasks.create( "createIcon-" + dir, Exec ) {
         def outdir = new File( "res", "drawable-" + dir )
         outputs.dir( outdir )
@@ -45,15 +46,33 @@ def add_icon_task( dir, scale ) {
     }
 }
 
-tasks.whenTaskAdded { t ->
-      if (t.name.equals( "generateDebugResources" )) {
-          t.dependsOn add_icon_task( "ldpi", 0.75 )
-          t.dependsOn add_icon_task( "mdpi", 1 )
-          t.dependsOn add_icon_task( "hdpi", 1.5 )
-          t.dependsOn add_icon_task( "xhdpi", 2 )
-          t.dependsOn add_icon_task( "xxhdpi", 3 )
-          t.dependsOn add_icon_task( "xxxhdpi", 4 )
-      }
+def checksum_task()
+{
+    return tasks.create( "checksumAssets", Exec ) {
+        commandLine "sh", "-c",
+                    "(test -d assets && " +
+                    "rm -f assets/files.sum assets/sums.sum && " +
+                    "sha256sum \$(find assets -type f -print) | sed 's/ assets\\// /' >files.sum && " +
+                    "sha256sum files.sum >sums.sum && " +
+                    "mv files.sum sums.sum assets) || rm -rf assets";
+    }
+}
+
+tasks.whenTaskAdded
+{
+    if (name.equals( "generateDebugResources" ))
+    {
+        dependsOn add_icon_task( "ldpi", 0.75 )
+        dependsOn add_icon_task( "mdpi", 1 )
+        dependsOn add_icon_task( "hdpi", 1.5 )
+        dependsOn add_icon_task( "xhdpi", 2 )
+        dependsOn add_icon_task( "xxhdpi", 3 )
+        dependsOn add_icon_task( "xxxhdpi", 4 )
+    }
+    if (name.equals( "generateDebugAssets" ))
+    {
+        dependsOn checksum_task()
+    }
 }
 
 tasks.withType(JavaCompile)