make libwebsockets optional

meson.build

@@ -2,8 +2,12 @@ project('webfuse', 'c', 'cpp', version: '0.6.0', license: 'LGPL-3.0+')
 
 without_tests = get_option('without_tests')
 
-libwebsockets_dep = dependency('libwebsockets', version: '>=4.0.0')
-libfuse_dep = dependency('fuse3', version: '>=3.8.0')
+libwebsockets_dep = dependency('libwebsockets', version: '>=4.0.0', required: false)
+if not libwebsockets_dep.found()
+  libwebsockets_dep = declare_dependency(link_with: 'websockets')
+endif
+
+libfuse_dep = dependency('fuse3', version: '>=3.1.0')
 
 pkg_config = import('pkgconfig')
 
@@ -202,4 +206,4 @@ alltests = executable('alltests',
 
 test('alltests', alltests)
 
-endif
+endif