Update build_for_ios.sh

build_for_ios.sh

@@ -10,4 +10,5 @@ cd ZLMediaKit
 mkdir -p build
 cd build
 cmake .. -DCMAKE_TOOLCHAIN_FILE=../cmake/iOS.cmake -DIOS_PLATFORM=OS
-make -j4
\ No newline at end of file
+make -j4
+sudo make install