[meta] add missing license headers for some .cmake/.sh (#2878)

Mainly so doing `UPDATE=1 .ci/license-header.sh` doesnt just spam them everytime (I have like a copy of them on almost every stash ever since haha)
Signed-off-by: lizzie <lizzie@eden-emu.dev>

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/2878
Reviewed-by: crueter <crueter@eden-emu.dev>
Co-authored-by: lizzie <lizzie@eden-emu.dev>
Co-committed-by: lizzie <lizzie@eden-emu.dev>

CMakeModules/Findzstd.cmake

@@ -1,3 +1,6 @@
+# SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+# SPDX-License-Identifier: GPL-3.0-or-later
+
 # SPDX-FileCopyrightText: 2022 yuzu Emulator Project
 # SPDX-License-Identifier: GPL-2.0-or-later
 

tools/generate-legacy-icons.sh

@@ -1,5 +1,8 @@
 #!/bin/sh -e
 
+# SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+# SPDX-License-Identifier: GPL-3.0-or-later
+
 # Generate SDK <26 icons for android
 # requires imagemagick, inkscape
 

tools/translations/lupdate.sh

@@ -1,5 +1,8 @@
 #!/bin/sh
 
+# SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+# SPDX-License-Identifier: GPL-3.0-or-later
+
 for i in dist/languages/*.ts; do
     SRC=en_US
     TARGET=`head -n1 $i | awk -F 'language="' '{split($2, a, "\""); print a[1]}'`

tools/translations/qt-source.sh

@@ -1,5 +1,8 @@
 #!/bin/sh
 
+# SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+# SPDX-License-Identifier: GPL-3.0-or-later
+
 SRC=en_US
 TARGET=en_US
 

tools/translations/update-translations.sh

@@ -1,5 +1,8 @@
 #!/bin/sh
 
+# SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+# SPDX-License-Identifier: GPL-3.0-or-later
+
 command -v tx-cli && COMMAND=tx-cli
 command -v tx && COMMAND=tx