contrib/nix: work around clang errors in unicode gem

Same new clang error as in ncursesw, but in this case it's just missing
casts, not misdeclared arguments. There's no clear upstream to publish
a proper fix so let's just suppress the error for now so that the gem
build on MacOS can succeed.

contrib/nix/ruby2.4-shell.nix

@@ -24,6 +24,13 @@ let
           })
         ];
       };
+      # Workaround for a new error in clang 16 (MacOS):
+      # https://github.com/blackwinter/unicode/pull/11
+      unicode = attrs: {
+        buildFlags = [
+          "--with-cflags=-Wno-incompatible-function-pointer-types"
+        ];
+      };
       # Workaround: remove rake from nativeBuildInputs, otherwise it causes
       # xapian-bindings to build against the default Ruby version
       # instead of our chosen version.

contrib/nix/ruby2.5-shell.nix

@@ -24,6 +24,13 @@ let
           })
         ];
       };
+      # Workaround for a new error in clang 16 (MacOS):
+      # https://github.com/blackwinter/unicode/pull/11
+      unicode = attrs: {
+        buildFlags = [
+          "--with-cflags=-Wno-incompatible-function-pointer-types"
+        ];
+      };
       # Workaround: remove rake from nativeBuildInputs, otherwise it causes
       # xapian-bindings to build against the default Ruby version
       # instead of our chosen version.

contrib/nix/ruby2.6-shell.nix

@@ -24,6 +24,13 @@ let
           })
         ];
       };
+      # Workaround for a new error in clang 16 (MacOS):
+      # https://github.com/blackwinter/unicode/pull/11
+      unicode = attrs: {
+        buildFlags = [
+          "--with-cflags=-Wno-incompatible-function-pointer-types"
+        ];
+      };
       # Workaround: remove rake from nativeBuildInputs, otherwise it causes
       # xapian-bindings to build against the default Ruby version
       # instead of our chosen version.

contrib/nix/ruby2.7-shell.nix

@@ -24,6 +24,13 @@ let
           })
         ];
       };
+      # Workaround for a new error in clang 16 (MacOS):
+      # https://github.com/blackwinter/unicode/pull/11
+      unicode = attrs: {
+        buildFlags = [
+          "--with-cflags=-Wno-incompatible-function-pointer-types"
+        ];
+      };
     };
   };
 in pkgs.mkShell { packages = [ gems gems.wrappedRuby pkgs.pandoc ]; }

contrib/nix/ruby3.0-shell.nix

@@ -24,6 +24,13 @@ let
           })
         ];
       };
+      # Workaround for a new error in clang 16 (MacOS):
+      # https://github.com/blackwinter/unicode/pull/11
+      unicode = attrs: {
+        buildFlags = [
+          "--with-cflags=-Wno-incompatible-function-pointer-types"
+        ];
+      };
     };
   };
 in pkgs.mkShell { packages = [ gems gems.wrappedRuby pkgs.pandoc ]; }

contrib/nix/ruby3.1-shell.nix

@@ -24,6 +24,13 @@ let
           })
         ];
       };
+      # Workaround for a new error in clang 16 (MacOS):
+      # https://github.com/blackwinter/unicode/pull/11
+      unicode = attrs: {
+        buildFlags = [
+          "--with-cflags=-Wno-incompatible-function-pointer-types"
+        ];
+      };
     };
   };
 in pkgs.mkShell { packages = [ gems gems.wrappedRuby pkgs.pandoc ]; }

contrib/nix/ruby3.2-shell.nix

@@ -24,6 +24,13 @@ let
           })
         ];
       };
+      # Workaround for a new error in clang 16 (MacOS):
+      # https://github.com/blackwinter/unicode/pull/11
+      unicode = attrs: {
+        buildFlags = [
+          "--with-cflags=-Wno-incompatible-function-pointer-types"
+        ];
+      };
     };
   };
 in pkgs.mkShell { packages = [ gems gems.wrappedRuby pkgs.pandoc ]; }

contrib/nix/ruby3.3-shell.nix

@@ -24,6 +24,13 @@ let
           })
         ];
       };
+      # Workaround for a new error in clang 16 (MacOS):
+      # https://github.com/blackwinter/unicode/pull/11
+      unicode = attrs: {
+        buildFlags = [
+          "--with-cflags=-Wno-incompatible-function-pointer-types"
+        ];
+      };
     };
   };
 in pkgs.mkShell { packages = [ gems gems.wrappedRuby pkgs.pandoc ]; }