Integrate libdeflate with the build system

CMakeLists.txt

@@ -138,4 +138,5 @@ target_include_directories(scylla PUBLIC
         ${SEASTAR_INCLUDE_DIRS}
         ${Boost_INCLUDE_DIRS}
         xxhash
+        libdeflate
         build/release/gen)

configure.py

@@ -1008,6 +1008,8 @@ seastar_ldflags = args.user_ldflags
 seastar_flags += ['--compiler', args.cxx, '--c-compiler', args.cc, '--cflags=%s' % (seastar_cflags), '--ldflags=%s' % (seastar_ldflags),
                   '--c++-dialect=gnu++1z', '--optflags=%s' % (modes['release']['opt']), ]
 
+libdeflate_cflags = seastar_cflags
+
 status = subprocess.call([args.python, './configure.py'] + seastar_flags, cwd='seastar')
 
 if status != 0:
@@ -1179,6 +1181,9 @@ with open(buildfile, 'w') as f:
             if binary.endswith('.a'):
                 f.write('build $builddir/{}/{}: ar.{} {}\n'.format(mode, binary, mode, str.join(' ', objs)))
             else:
+                objs.extend(['$builddir/' + mode + '/' + artifact for artifact in [
+                    'libdeflate/libdeflate.a'
+                ]])
                 if binary.startswith('tests/'):
                     local_libs = '$libs'
                     if binary not in tests_not_using_seastar_test_framework or binary in pure_boost_tests:
@@ -1269,6 +1274,10 @@ with open(buildfile, 'w') as f:
             ''').format(**locals()))
         f.write('build build/{mode}/scylla-package.tar.gz: package build/{mode}/scylla build/{mode}/iotune build/SCYLLA-RELEASE-FILE build/SCYLLA-VERSION-FILE | always\n'.format(**locals()))
         f.write('    mode = {mode}\n'.format(**locals()))
+        f.write('rule libdeflate.{mode}\n'.format(**locals()))
+        f.write('    command = make -C libdeflate BUILD_DIR=../build/{mode}/libdeflate/ CFLAGS="{libdeflate_cflags}"\n'.format(**locals()))
+        f.write('build build/{mode}/libdeflate/libdeflate.a: libdeflate.{mode}\n'.format(**locals()))
+
     f.write('build {}: phony\n'.format(seastar_deps))
     f.write(textwrap.dedent('''\
         rule configure