setup.py: include libmupdf-threads in mupdf-devel/lib/.

setup.py

@@ -553,6 +553,7 @@ def build():
     # Download MuPDF.
     #
     mupdf_local, mupdf_location = get_mupdf()
+    mupdf_version_tuple = get_mupdf_version(mupdf_local)
 
     build_type = os.environ.get( 'PYMUPDF_SETUP_MUPDF_BUILD_TYPE', 'release')
     assert build_type in ('debug', 'memento', 'release'), \
@@ -644,10 +645,17 @@ def add(flavour, from_, to_):
             # Add Windows .lib files.
             mupdf_build_dir2 = _windows_lib_directory(mupdf_local, build_type)
             add('d', f'{mupdf_build_dir2}/mupdfcpp{wp.cpu.windows_suffix}.lib', f'{to_dir_d}/lib/')
+            if mupdf_version_tuple >= (1, 25):
+                # MuPDF-1.25+ language bindings build also builds libmuthreads.
+                add('d', f'{mupdf_build_dir2}/libmuthreads.lib', f'{to_dir_d}/lib/')
         elif darwin:
             add('p', f'{mupdf_build_dir}/_mupdf.so', to_dir)
             add('b', f'{mupdf_build_dir}/libmupdfcpp.so', to_dir)
-            add('b', f'{mupdf_build_dir}/libmupdf.dylib', f'{to_dir}libmupdf.dylib')
+            add('b', f'{mupdf_build_dir}/libmupdf.dylib', to_dir)
+            if mupdf_version_tuple >= (1, 25):
+                # MuPDF-1.25+ language bindings build also builds
+                # libmupdf-threads.a.
+                add('d', f'{mupdf_build_dir}/libmupdf-threads.a', f'{to_dir_d}/lib/')
         elif pyodide:
             add('p', f'{mupdf_build_dir}/_mupdf.so', to_dir)
             add('b', f'{mupdf_build_dir}/libmupdfcpp.so', 'PyMuPDF.libs/')
@@ -656,6 +664,10 @@ def add(flavour, from_, to_):
             add('p', f'{mupdf_build_dir}/_mupdf.so', to_dir)
             add('b', pipcl.get_soname(f'{mupdf_build_dir}/libmupdfcpp.so'), to_dir)
             add('b', pipcl.get_soname(f'{mupdf_build_dir}/libmupdf.so'), to_dir)
+            if mupdf_version_tuple >= (1, 25):
+                # MuPDF-1.25+ language bindings build also builds
+                # libmupdf-threads.a.
+                add('d', f'{mupdf_build_dir}/libmupdf-threads.a', f'{to_dir_d}/lib/')
 
         if 'd' in PYMUPDF_SETUP_FLAVOUR:
             # Add MuPDF C and C++ headers to `ret_d`. Would prefer to use