Revert incorrect copyright attribution for non-contributed files

- In commit b3facaa6bb, the copyright header was
  updated to include "Citron Homebrew Project" across multiple files, regardless
  of whether any contributions were made.

- This commit removes the incorrect attribution and reverts the copyright header
  to its previous state.

- Copyright attribution should only be added when meaningful contributions have
  been made to the file.

- This commit ensures proper compliance with copyright standards and maintains
  correct attribution to the respective contributors.

- Special thanks to Tachi for pointing out the need for these corrections and
  ensuring that proper attribution practices are followed.

externals/CMakeLists.txt

@@ -1,4 +1,4 @@
-# SPDX-FileCopyrightText: 2016 Citra Emulator Project & 2025 Citron Homebrew Project
+# SPDX-FileCopyrightText: 2016 Citra Emulator Project
 # SPDX-License-Identifier: GPL-2.0-or-later
 
 # Dynarmic has cmake_minimum_required(3.12) and we may want to override

externals/ffmpeg/CMakeLists.txt

@@ -1,4 +1,4 @@
-# SPDX-FileCopyrightText: 2021 yuzu Emulator Project & 2025 citron Homebrew Project
+# SPDX-FileCopyrightText: 2021 yuzu Emulator Project
 # SPDX-License-Identifier: GPL-2.0-or-later
 
 if (NOT WIN32 AND NOT ANDROID)

externals/libusb/CMakeLists.txt

@@ -1,4 +1,4 @@
-# SPDX-FileCopyrightText: 2020 yuzu Emulator Project & 2025 citron Homebrew Project
+# SPDX-FileCopyrightText: 2020 yuzu Emulator Project
 # SPDX-License-Identifier: GPL-2.0-or-later
 
 if (MINGW OR (${CMAKE_SYSTEM_NAME} MATCHES "Linux") OR APPLE)

externals/libusb/config.h.in

@@ -1,5 +1,5 @@
 /* 
- * SPDX-FileCopyrightText: 2020 yuzu Emulator Project & 2025 citron Homebrew Project
+ * SPDX-FileCopyrightText: 2020 yuzu Emulator Project
  * SPDX-License-Identifier: GPL-2.0-or-later
  */
 

externals/nx_tzdb/CMakeLists.txt

@@ -1,4 +1,4 @@
-# SPDX-FileCopyrightText: 2023 yuzu Emulator Project & 2025 citron Homebrew Project
+# SPDX-FileCopyrightText: 2023 yuzu Emulator Project
 # SPDX-License-Identifier: GPL-2.0-or-later
 
 set(NX_TZDB_INCLUDE_DIR "${CMAKE_CURRENT_BINARY_DIR}/include")

externals/nx_tzdb/ListFilesInDirectory.cmake

@@ -1,4 +1,4 @@
-# SPDX-FileCopyrightText: 2023 yuzu Emulator Project & 2025 citron Homebrew Project
+# SPDX-FileCopyrightText: 2023 yuzu Emulator Project
 # SPDX-License-Identifier: GPL-2.0-or-later
 
 # CMake does not have a way to list the files in a specific directory, 

externals/nx_tzdb/NxTzdbCreateHeader.cmake

@@ -1,4 +1,4 @@
-# SPDX-FileCopyrightText: 2023 yuzu Emulator Project & 2025 citron Homebrew Project
+# SPDX-FileCopyrightText: 2023 yuzu Emulator Project
 # SPDX-License-Identifier: GPL-2.0-or-later
 
 set(ZONE_PATH ${CMAKE_ARGV3})

externals/nx_tzdb/include/nx_tzdb.h

@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: 2023 yuzu Emulator Project & 2025 citron Homebrew Project
+// SPDX-FileCopyrightText: 2023 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #pragma once

externals/nx_tzdb/tzdb_template.h.in

@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: 2023 yuzu Emulator Project & 2025 citron Homebrew Project
+// SPDX-FileCopyrightText: 2023 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #pragma once

externals/tz/tz/tz.cpp

@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: 2023 yuzu Emulator Project & 2025 citron Homebrew Project
+// SPDX-FileCopyrightText: 2023 yuzu Emulator Project
 // SPDX-FileCopyrightText: 1996 Arthur David Olson
 // SPDX-License-Identifier: BSD-2-Clause
 

externals/tz/tz/tz.h

@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: 2023 yuzu Emulator Project & 2025 citron Homebrew Project
+// SPDX-FileCopyrightText: 2023 yuzu Emulator Project
 // SPDX-FileCopyrightText: 1996 Arthur David Olson
 // SPDX-License-Identifier: BSD-2-Clause