[pygobject] Revert the dependency bump for libffi

[Christoph Reiter <creiter src gnome org>]

commit 4208cf1d5eb683c947cf1cd4e5c8830cf336a3f2
Author: Christoph Reiter <reiter christoph gmail com>
Date:   Tue Sep 15 17:42:10 2020 +0200

    Revert the dependency bump for libffi
    
    It results in crashes downstream (pulls in a meson fallback in gst-ci)
    and it isn't really needed, so revert for now.
    
    Also Fedora only has 3.1 it turns out.

 meson.build | 2 +-
 setup.py    | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/meson.build b/meson.build
index bd07f9f2..f7e9e797 100644
--- a/meson.build
+++ b/meson.build
@@ -24,7 +24,7 @@ python_dep = python.dependency()
 glib_version_req = '>= 2.56.0'
 gi_version_req = '>= 1.56.0'
 pycairo_version_req = '>= 1.16.0'
-libffi_version_req = '>= 3.2'
+libffi_version_req = '>= 3.0'
 
 gi_dep = dependency('gobject-introspection-1.0', version : gi_version_req,
   fallback: ['gobject-introspection', 'girepo_dep'])
diff --git a/setup.py b/setup.py
index fce5b4af..228b4f66 100755
--- a/setup.py
+++ b/setup.py
@@ -41,7 +41,7 @@ PYGOBJECT_VERSION = "3.39.0"
 GLIB_VERSION_REQUIRED = "2.56.0"
 GI_VERSION_REQUIRED = "1.56.0"
 PYCAIRO_VERSION_REQUIRED = "1.16.0"
-LIBFFI_VERSION_REQUIRED = "3.2"
+LIBFFI_VERSION_REQUIRED = "3.0"
 
 WITH_CAIRO = not bool(os.environ.get("PYGOBJECT_WITHOUT_PYCAIRO"))
 """Set PYGOBJECT_WITHOUT_PYCAIRO if you don't want to build with