Meson fails to detect bitsery, function2 and gulrak-filesystem.
https://github.com/robbert-vdh/yabridge/issues/18

This patch removes these dependencies in "meson.build".


diff --git a/meson.build b/meson.build
index d8d9135b..b35ebfcd 100644
--- a/meson.build
+++ b/meson.build
@@ -248,22 +248,13 @@ else
   asio_dep = dependency('asio', version : '>=1.22.0')
 endif
 
-if meson.version().version_compare('>=0.60')
-  # Bitsery's CMake build definition is capitalized for some reason
-  bitsery_dep = dependency('bitsery', 'Bitsery', version : '>=5.2.0')
-else
-  # Mmeson <=0.6.0 didn't support multiple names for a dependency, and since at
-  # the moment this is only relevant for packing on Arch btw, it's probably
-  # better to remove this conditional later than it is to bump the minimum Meson
-  # version now.
-  bitsery_dep = dependency('bitsery', version : '>=5.2.0')
-endif
+bitsery_dep = declare_dependency()
 
 # The D-Bus headers are also only accessed through the include path. We don't
 # link to libdbus-1 to make soname changes don't completely break yabridge.
 dbus_dep = dependency('dbus-1').partial_dependency(compile_args : true, includes : true)
-function2_dep = dependency('function2', version : '>=4.0.0')
-ghc_filesystem_dep = dependency('ghc_filesystem', modules : 'ghcFilesystem::ghc_filesystem', version : '>=1.5.0')
+function2_dep = declare_dependency()
+ghc_filesystem_dep = declare_dependency()
 threads_dep = dependency('threads')
 # Tomlplusplus recently added a shraed library version. We don't want to link to that.
 tomlplusplus_dep = dependency('tomlplusplus', version : '>=3.3.0', default_options : ['compile_library=false']).partial_dependency(compile_args : true, includes : true)