Enable pch and unity option in compiling process of rpm mode in order to keep...

Enable pch and unity option in compiling process of rpm mode in order to keep consistent with other modes.

build.sh

@@ -116,7 +116,7 @@ function build
         do_build "$@" -DCMAKE_BUILD_TYPE=Debug
         ;;
       xrpm)
-        do_build "$@" -DCMAKE_BUILD_TYPE=RelWithDebInfo -DOB_USE_CCACHE=OFF -DOB_COMPRESS_DEBUG_SECTIONS=ON -DOB_STATIC_LINK_LGPL_DEPS=OFF -DOB_ENABLE_PCH=OFF -DOB_ENALBE_UNITY=OFF
+        do_build "$@" -DCMAKE_BUILD_TYPE=RelWithDebInfo -DOB_USE_CCACHE=OFF -DOB_COMPRESS_DEBUG_SECTIONS=ON -DOB_STATIC_LINK_LGPL_DEPS=OFF
         ;;
       *)
         BUILD_ARGS=(debug "${BUILD_ARGS[@]}")