fix(cmakev2/build): display a warning when the MINIMAL_BUILD property is set

The MINIMAL_BUILD property is not relevant in cmakev2, as only
components explicitly linked through targets are included in the build
by design. Display a warning when this outdated build property is set.

Signed-off-by: Frantisek Hrbata <frantisek.hrbata@espressif.com>

tools/cmakev2/build.cmake

@@ -37,6 +37,10 @@ function(idf_build_set_property property value)
     set(multi_value)
     cmake_parse_arguments(ARG "${options}" "${one_value}" "${multi_value}" ${ARGN})
 
+    if("${property}" STREQUAL MINIMAL_BUILD)
+        idf_warn("Build property 'MINIMAL_BUILD' is obsolete and will be ignored")
+    endif()
+
     set(append)
     if(ARG_APPEND)
         set(append APPEND)