EMCMAKE is unable to detect Python3 version

Please include the following in your bug report:

**Version of emscripten/emsdk:**
emcc (Emscripten gcc/clang-like replacement + linker emulating GNU ld) 3.1.58 (a41843e0860e52c948c1fce20307933c6631c800)
clang version 19.0.0git (https:/github.com/llvm/llvm-project 0a8cd1ed1f4f35905df318015b0dbcb69d81d7c2)
Target: wasm32-unknown-emscripten
Thread model: posix

**Failing command line in full:**
emcmake cmake -S .

**Full link command and output with `-v` appended:**
-- Could NOT find Python3 (missing: Python3_INCLUDE_DIRS Python3_LIBRARIES Development Development.Module Development.Embed) (found version "3.11.9")

If I remove emcmake and just include cmake, it is able to find python

```cpp
-- The C compiler identification is GNU 9.3.0
-- The CXX compiler identification is GNU 9.3.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Found Python3: /usr/bin/python3.11 (found version "3.11.9") found components: Interpreter Development Development.Module Development.Embed
-- Configuring done (0.5s)
-- Generating done (0.0s)
```

Attaching CMakeList.txt for your reference
[CMakeLists.txt](https://github.com/user-attachments/files/16710862/CMakeLists.txt)