try to fix file endings for old Pd versions

.github/workflows/compile-and-artifacts.yml

@@ -50,7 +50,12 @@ jobs:
         run: brew install make
 
       - name: Compile external
-        run: make install floatsize=${{ matrix.precision }} extension=darwin-${{ matrix.arch }}-${{ matrix.precision }}.so arch="x86_64 arm64"
+        run: |
+          if [ ${{ matrix.precision }} -eq 32 ]; then
+            make install floatsize=32 extension=d_fat arch="x86_64 arm64"
+          else
+            make install floatsize=64 extension=darwin-${{ matrix.arch }}-{{ matrix.precision }}.so arch="x86_64 arm64"
+          fi
 
       - name: Archive artifacts
         uses: actions/upload-artifact@v4
@@ -82,7 +87,7 @@ jobs:
         shell: bash
         run: |
           export PATH="/c/msys64/mingw64/bin:$PATH"  # Ensure MinGW GCC is preferred if needed
-          make install CC=gcc PDINCLUDEDIR="pd-${{env.PD_VERSION}}/src" PDDIR="pd-${{env.PD_VERSION}}" PDBINDIR="pd-${{env.PD_VERSION}}/bin" extension=windows-${{ matrix.arch }}-32.dll
+          make install CC=gcc PDINCLUDEDIR="pd-${{env.PD_VERSION}}/src" PDDIR="pd-${{env.PD_VERSION}}" PDBINDIR="pd-${{env.PD_VERSION}}/bin" extension=dll
 
       - name: Archive artifacts
         uses: actions/upload-artifact@v4

simplex~.c

@@ -36,7 +36,7 @@
 #define G4_4 0.5527864045
 
 typedef void (*t_signal_setmultiout)(t_signal **, int); 
-static t_signal_setmultiout g_signal_setmultiout;
+t_signal_setmultiout g_signal_setmultiout;
 static t_class *simplex_tilde_class;
 
 typedef struct _simplex_tilde {