Move build/android directory to root of project (#11283)

android/native/build.gradle

@@ -0,0 +1,98 @@
+apply plugin: 'com.android.library'
+apply plugin: 'de.undercouch.download'
+
+android {
+	compileSdkVersion 29
+	buildToolsVersion '30.0.3'
+	ndkVersion '22.0.7026061'
+	defaultConfig {
+		minSdkVersion 16
+		targetSdkVersion 29
+		externalNativeBuild {
+			ndkBuild {
+				arguments '-j' + Runtime.getRuntime().availableProcessors(),
+						"versionMajor=${versionMajor}",
+						"versionMinor=${versionMinor}",
+						"versionPatch=${versionPatch}",
+						"versionExtra=${versionExtra}"
+			}
+		}
+	}
+
+	externalNativeBuild {
+		ndkBuild {
+			path file('jni/Android.mk')
+		}
+	}
+
+	// supported architectures
+	splits {
+		abi {
+			enable true
+			reset()
+			include 'armeabi-v7a', 'arm64-v8a'//, 'x86'
+		}
+	}
+
+	buildTypes {
+		release {
+			externalNativeBuild {
+				ndkBuild {
+					arguments 'NDEBUG=1'
+				}
+			}
+		}
+	}
+}
+
+// get precompiled deps
+def folder = 'minetest_android_deps_binaries'
+
+task downloadDeps(type: Download) {
+	src 'https://github.com/minetest/' + folder + '/archive/master.zip'
+	dest new File(buildDir, 'deps.zip')
+	overwrite false
+}
+
+task getDeps(dependsOn: downloadDeps, type: Copy) {
+	def deps = file('deps')
+	def f = file("$buildDir/" + folder + "-master")
+
+	if (!deps.exists() && !f.exists()) {
+		from zipTree(downloadDeps.dest)
+		into buildDir
+	}
+
+	doLast {
+		if (!deps.exists()) {
+			file(f).renameTo(file(deps))
+		}
+	}
+}
+
+// get sqlite
+def sqlite_ver = '3340000'
+task downloadSqlite(dependsOn: getDeps, type: Download) {
+	src 'https://www.sqlite.org/2020/sqlite-amalgamation-' + sqlite_ver + '.zip'
+	dest new File(buildDir, 'sqlite.zip')
+	overwrite false
+}
+
+task getSqlite(dependsOn: downloadSqlite, type: Copy) {
+	def sqlite = file('deps/Android/sqlite')
+	def f = file("$buildDir/sqlite-amalgamation-" + sqlite_ver)
+
+	if (!sqlite.exists() && !f.exists()) {
+		from zipTree(downloadSqlite.dest)
+		into buildDir
+	}
+
+	doLast {
+		if (!sqlite.exists()) {
+			file(f).renameTo(file(sqlite))
+		}
+	}
+}
+
+preBuild.dependsOn getDeps
+preBuild.dependsOn getSqlite