Fix CMake warnings: optional feature message level + policy version minimum (k2-fsa#3217)

* Downgrade optional feature messages from WARNING to STATUS

TTS and speaker diarization are optional features controlled by
SHERPA_ONNX_ENABLE_TTS and SHERPA_ONNX_ENABLE_SPEAKER_DIARIZATION.
Disabling an optional feature is a normal configuration choice, not a
warning condition. Using message(WARNING) causes spurious CMake warnings
for any project that intentionally sets these to OFF via FetchContent.

Change both to message(STATUS) to match the enabled-path messaging.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Raise CMAKE_POLICY_VERSION_MINIMUM from 3.5 to 3.10

CMake 4.x emits deprecation warnings for cmake_minimum_required()
versions below 3.10 ("Compatibility with CMake < 3.10 will be removed").
Several transitive deps (kaldi-native-fbank 3.5, kissfft 3.6, openfst
3.1) trigger this warning.

Raising the floor to 3.10 suppresses these deprecation notices while
preserving old policy behaviors for all deps. No functional change —
3.10 is still well below sherpa-onnx's own minimum of 3.15.

Co-authored-by: John Suykerbuyk <bd770i@suykerbuyk.org>

Author: suykerbuyk

CMakeLists.txt

@@ -1,5 +1,5 @@
 if (CMAKE_VERSION VERSION_GREATER_EQUAL "4.0.0")
-  set(CMAKE_POLICY_VERSION_MINIMUM 3.5)
+  set(CMAKE_POLICY_VERSION_MINIMUM 3.10)
 endif()
 
 cmake_minimum_required(VERSION 3.15 FATAL_ERROR)
@@ -261,15 +261,15 @@ if(SHERPA_ONNX_ENABLE_TTS)
   message(STATUS "TTS is enabled")
   add_definitions(-DSHERPA_ONNX_ENABLE_TTS=1)
 else()
-  message(WARNING "TTS is disabled")
+  message(STATUS "TTS is disabled")
   add_definitions(-DSHERPA_ONNX_ENABLE_TTS=0)
 endif()
 
 if(SHERPA_ONNX_ENABLE_SPEAKER_DIARIZATION)
   message(STATUS "speaker diarization is enabled")
   add_definitions(-DSHERPA_ONNX_ENABLE_SPEAKER_DIARIZATION=1)
 else()
-  message(WARNING "speaker diarization is disabled")
+  message(STATUS "speaker diarization is disabled")
   add_definitions(-DSHERPA_ONNX_ENABLE_SPEAKER_DIARIZATION=0)
 endif()