log4cpp port for ios and android

• For iOS Edit ios_build.sh to set platfrom at first.

  ./ios_build.sh

This will generate Xcode project file under ./build. Open log4cpp.xcodeproj by Xcode and build it, then it would generate liblog4cpp.a under build/bin . Change ios_build.sh for different lib version, and use

lipo -output libuniversal.a -create liba.a libb.b

to create a universal library for different platfrom.

• For Android To build for Android you should edit android_build.sh to set arguments like ndk path , api level at first.

./android_build.sh

Then the liblog4cpp.a would generate under build directory automatically.