[Windows] Fix windows build with mingw.

Forces ".dll" extension for library when building with mingw.

Override GDN_EXPORT which is incorrectly defined in the upstream
gdnative headers (3.x) and godot-cpp include (4.0) when building for
windows with mingw.

1 files changed, 4 insertions, 0 deletions

diff --git a/SConstruct b/SConstruct
index 56bb711..e79913e 100644
--- a/SConstruct
+++ b/SConstruct
@@ -67,6 +67,10 @@ else:
     })
     env = env.Clone()
 
+# Patch mingw SHLIBSUFFIX.
+if env["platform"] == "windows" and env["use_mingw"]:
+    env["SHLIBSUFFIX"] = ".dll"
+
 opts.Update(env)
 
 target = env["target"]