cmake: always build inner project for "CMakeProject-build" project

After:

$ make
[ 33%] Built target CMakeProject-src-download
[ 37%] Performing build step for 'CMakeProject-build'
-- CMakeProject-build build command succeeded.  See also /work/_skbuild/cmake-build/CMakeProject-build-prefix/src/CMakeProject-build-stamp/CMakeProject-build-build-*.log
[ 41%] No install step for 'CMakeProject-build'
[ 45%] Completed 'CMakeProject-build'
[ 66%] Built target CMakeProject-build
[ 70%] Performing configure step for 'CMakePythonDistributions'
loading initial cache file /work/_skbuild/cmake-build/CMakePythonDistributions-prefix/tmp/CMakePythonDistributions-cache-Release.cmake
-- Configuring done
-- Generating done
-- Build files have been written to: /work/_skbuild/cmake-build/CMakePythonDistributions-build
[ 75%] Performing build step for 'CMakePythonDistributions'
[ 79%] No install step for 'CMakePythonDistributions'
[ 83%] Completed 'CMakePythonDistributions'
[100%] Built target CMakePythonDistributions


Before:

$ make
[ 33%] Built target CMakeProject-src-download
[ 66%] Built target CMakeProject-build
[100%] Built target CMakePythonDistributions

Author: jcfr

CMakeLists.txt

@@ -107,7 +107,6 @@ if(CMakePythonDistributions_SUPERBUILD)
       CONFIGURE_COMMAND ""
       BUILD_COMMAND ""
       BUILD_IN_SOURCE 1
-      BUILD_ALWAYS 1
       INSTALL_COMMAND ""
       ${depends_args}
       )
@@ -178,6 +177,7 @@ if(CMakePythonDistributions_SUPERBUILD)
         BINARY_DIR ${CMakeProject_BINARY_DIR}
         DOWNLOAD_COMMAND ""
         UPDATE_COMMAND ""
+        BUILD_ALWAYS 1
         CMAKE_CACHE_ARGS
           -DBUILD_CursesDialog:BOOL=OFF
           -DCMAKE_USE_OPENSSL:BOOL=ON