build: add maintainer build option

Add a shared MAINTAINER_BUILD CMake option for maintainer-only helpers
and diagnostics.

The option is disabled by default and is intended for development and
compatibility testing only. When enabled, it defines MAINTAINER_BUILD for
the build so server-side diagnostic code can be guarded behind the same
switch used by the DOS tools submodule.

This keeps extra NCP tracing and test-only support out of normal builds
while allowing both mars_nwe and dostools to use one common maintainer
mode.

CMakeLists.txt

@@ -63,6 +63,7 @@ INCLUDE(${CMAKE_MODULE_PATH}/MarsNweInstallDirs.cmake)
 option(ENABLE_DEBUG "Compile in MARS NWE debug logging code (DO_DEBUG)" OFF)
 option(ENABLE_DEBUG_BUILD "Build with debug compiler flags (-g3 -O0 -fno-omit-frame-pointer)" OFF)
 option(ENABLE_DEBUG_DOSUTILS "Enable NCP 17/02 debugging support for mars_dosutils" OFF)
+option(MAINTAINER_BUILD "Enable maintainer-only test helpers and diagnostics" OFF)
 option(ENABLE_INTERNAL_RIP_SAP "Should we build Mars Nwe with Internal Router?" ON)
 option(ENABLE_SHADOW_PWD "Should we build Mars Nwe with Shadow Password Support?" ON)
 option(ENABLE_QUOTA_SUPPORT "Should we build Mars Nwe with Quota Support?" ON)
@@ -90,6 +91,10 @@ if(ENABLE_DEBUG_BUILD)
     )
 endif()
 
+if(MAINTAINER_BUILD)
+    add_compile_definitions(MAINTAINER_BUILD)
+endif()
+
 if(NOT CMAKE_CONFIGURATION_TYPES)
     set_property(CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS
         "Debug" "Release" "RelWithDebInfo" "MinSizeRel")
@@ -191,6 +196,7 @@ message(STATUS "SMArT admin group: ${MARS_NWE_SMART_ADMIN_GROUP}")
 message(STATUS "Install DOS utilities: ${MARS_NWE_INSTALL_DOSUTILS}")
 message(STATUS "Install new DOS utilities: ${MARS_NWE_INSTALL_NEW_DOSUTILS}")
 message(STATUS "Build DOS utilities: ${MARS_NWE_BUILD_DOSUTILS}")
+message(STATUS "Maintainer build: ${MAINTAINER_BUILD}")
 
 # put the include dirs which are in the source or build tree
 # before all other include dirs, so the headers in the sources