fix: Windows pmm clean — use DeleteFileA (RemoveFileA doesn't exist)

clean_rm referenced the nonexistent RemoveFileA, so the windows-amd64 matrix
failed to link. Use DeleteFileA (the real Win32 API) for file removal.

src/main.c

@@ -828,7 +828,7 @@ static void clean_rm(const char *path) {
             } else {
                 ULONGLONG sz = ((ULONGLONG)fd.nFileSizeHigh << 32) | fd.nFileSizeLow;
                 g_clean_size += (unsigned long long)sz; g_clean_count++;
-                RemoveFileA(full);
+                DeleteFileA(full);
             }
         } while (FindNextFileA(h, &fd));
         FindClose(h);