Use pycompilation if installed.

[moorepants]

Currently have this error:

File ~/src/opty/opty/utils.py:477, in ufuncify_matrix(args, expr, const, tmp_dir, parallel)
    474     if parallel:
    475         options += ['openmp']
--> 477     cython_module = pycompilation.compile_link_import_strings(
    478         sources, options=options, std='c99', logger=True,
    479         include_dirs=[np.get_include()], build_dir=codedir)
    480 else:
    481     workingdir = os.getcwd()

File ~/miniconda/envs/muscle-bike-paper/lib/python3.11/site-packages/pycompilation/compilation.py:717, in compile_link_import_strings(codes, build_dir, **kwargs)
    714                 ofh_md5.write(md5_in_mem)
    715     source_files.append(dest)
--> 717 return compile_link_import_py_ext(
    718     source_files, build_dir=build_dir, **kwargs)

File ~/miniconda/envs/muscle-bike-paper/lib/python3.11/site-packages/pycompilation/compilation.py:666, in compile_link_import_py_ext(srcs, extname, build_dir, compile_kwargs, link_kwargs, **kwargs)
    664     mod = import_module_from_file(os.path.join(build_dir, extname), srcs)
    665 except ImportError:
--> 666     objs = compile_sources(list(map(get_abspath, srcs)), destdir=build_dir,
    667                            cwd=build_dir, **compile_kwargs)
    668     so = link_py_so(
    669         objs, cwd=build_dir, fort=any_fort(srcs), cplus=any_cplus(srcs),
    670         **link_kwargs)
    671     mod = import_module_from_file(so)

File ~/miniconda/envs/muscle-bike-paper/lib/python3.11/site-packages/pycompilation/compilation.py:149, in compile_sources(files, CompilerRunner_, destdir, cwd, keep_dir_struct, per_file_kwargs, **kwargs)
    147     file_kwargs = kwargs.copy()
    148     file_kwargs.update(_per_file_kwargs.get(f, {}))
--> 149     dstpaths.append(src2obj(
    150         f, CompilerRunner_, cwd=cwd,
    151         **file_kwargs
    152     ))
    153 return dstpaths

File ~/miniconda/envs/muscle-bike-paper/lib/python3.11/site-packages/pycompilation/compilation.py:449, in src2obj(srcpath, CompilerRunner_, objpath, only_update, cwd, out_ext, inc_py, **kwargs)
    444     return pyx2obj(srcpath, objpath=objpath,
    445                    include_dirs=include_dirs, cwd=cwd,
    446                    only_update=only_update, **kwargs)
    448 if CompilerRunner_ is None:
--> 449     CompilerRunner_, std = extension_mapping[ext.lower()]
    450     if 'std' not in kwargs:
    451         kwargs['std'] = std

KeyError: '.h'
> /home/moorepants/miniconda/envs/muscle-bike-paper/lib/python3.11/site-packages/pycompilation/compilation.py(449)src2obj()
    447 
    448     if CompilerRunner_ is None:
--> 449         CompilerRunner_, std = extension_mapping[ext.lower()]
    450         if 'std' not in kwargs:
    451             kwargs['std'] = std

[moorepants]

Closing in favor of #109.