Automatic minsdkversion setup added;

Linker problems on armeabi-v7a+NEON with Android 2.2 fixed;

android/service/engine/AndroidManifest.xml

@@ -4,7 +4,7 @@
     android:versionCode="22@ANDROID_PLATFORM_VERSION_CODE@"
     android:versionName="2.2" >
 
-    <uses-sdk android:minSdkVersion="8" />
+    <uses-sdk android:minSdkVersion="@ANDROID_NATIVE_API_LEVEL@" />
     <uses-feature android:name="android.hardware.touchscreen" android:required="false"/>
 
     <application

android/service/engine/CMakeLists.txt

@@ -7,15 +7,19 @@ add_android_project(opencv_engine "${CMAKE_CURRENT_SOURCE_DIR}" SDK_TARGET 8 ${A
 set(ANDROID_PLATFORM_VERSION_CODE "0")
 
 if(ARMEABI_V7A)
+  if (ANDROID_NATIVE_API_LEVEL LESS 9)
     set(ANDROID_PLATFORM_VERSION_CODE "2")
+  else()
+    set(ANDROID_PLATFORM_VERSION_CODE "3")
+  endif()
 elseif(ARMEABI_V6)
   set(ANDROID_PLATFORM_VERSION_CODE "1")
 elseif(ARMEABI)
   set(ANDROID_PLATFORM_VERSION_CODE "1")
 elseif(X86)
-    set(ANDROID_PLATFORM_VERSION_CODE "3")
-  elseif(MIPS)
   set(ANDROID_PLATFORM_VERSION_CODE "4")
+elseif(MIPS)
+  set(ANDROID_PLATFORM_VERSION_CODE "5")
 else()
   message(WARNING "Can not automatically determine the value for ANDROID_PLATFORM_VERSION_CODE")
 endif()