Fix indentation

Add .editorconfig to easily enforce indentation rules

.editorconfig

@@ -0,0 +1,7 @@
+root = true
+
+[*]
+insert_final_newline = true
+trim_trailing_whitespace = true
+indent_style = tab
+charset = utf-8

build.sh

@@ -115,7 +115,9 @@ fi
 export BUILD_NUM_CPUS=$NCPU
 
 # Fix Gradle compilation error
-[ -z "$ANDROID_NDK_HOME" ] && export ANDROID_NDK_HOME="$(which ndk-build | sed 's@/ndk-build@@')"
+if [ -z "$ANDROID_NDK_HOME" ]; then
+	export ANDROID_NDK_HOME="$(which ndk-build | sed 's@/ndk-build@@')"
+fi
 
 if [ -x project/jni/application/src/AndroidPreBuild.sh ]; then
 	pushd project/jni/application/src