cmake/main: rename VECTORIZED_CMAKE_DIR to REDPANDA_CMAKE_DIR

Signed-off-by: Ivo Jimenez <[email protected]>
(cherry picked from commit 13e56fd)

CMakeLists.txt

@@ -1,8 +1,13 @@
-cmake_minimum_required(VERSION 3.12.0)
-list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake)
-# keep this minimal. modify `cmake/main.cmake` file instead
-if(NOT VECTORIZED_CMAKE_DIR)
-  include(main)
-else()
-  include(${VECTORIZED_CMAKE_DIR}/main.cmake)
+# Redirect control for internal Redpanda builds
+if(REDPANDA_CMAKE_DIR)
+  cmake_minimum_required(VERSION 3.22)
+  list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake)
+  include(${REDPANDA_CMAKE_DIR}/main.cmake)
+  return()
 endif()
+
+cmake_minimum_required(VERSION 3.24)
+project(redpanda LANGUAGES CXX)
+
+list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake)
+include(main)