Add condition to CMP0148 cmake_policy

[Odilhao]

The introduction of #119 make it hard to not say impossible to build libcomps 0.1.23 without having to manually patch the libcomps/CMakeLists.txt file on CS9, on CentosStream9 we have cmake 3.26.5, this version does not support CPM0148.

Without this patch we get the following error:

      Not searching for unused variables given on the command line.
      -- The C compiler identification is GNU 11.5.0
      -- 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
      CMake Error at CMakeLists.txt:4 (cmake_policy):
        Policy "CMP0148" is not known to this version of CMake.
      -- Found ZLIB: /usr/lib64/libz.so (found version "1.2.11")
      -- Found LibXml2: /usr/lib64/libxml2.so (found version "2.9.13")
      -- Found EXPAT: /usr/lib64/libexpat.so (found version "2.5.0")
      /libcomps/libcomps/src/python/src
      -- Configuring incomplete, errors occurred!
      Traceback (most recent call last):
        File "/tmp/pip-build-env-t0500zkt/overlay/lib/python3.9/site-packages/skbuild/setuptools_wrap.py", line 660, in setup
          env = cmkr.configure(
        File "/tmp/pip-build-env-t0500zkt/overlay/lib/python3.9/site-packages/skbuild/cmaker.py", line 354, in configure
          raise SKBuildError(msg)
      An error occurred while configuring with CMake.

[ppisar]

Thanks for the patch. It looks good. Could you please correct the indentation?