ci: clone repos with shallow submodules

ci/build-linux-old.sh

@@ -5,7 +5,8 @@ set -e
 rm -rf subprojects
 mkdir -p subprojects
 git clone https://code.videolan.org/videolan/libplacebo.git \
-    --depth 1 --branch v6.338 --recurse-submodules subprojects/libplacebo
+    --recurse-submodules --shallow-submodules \
+    --depth=1 --branch v6.338 subprojects/libplacebo \
 
 meson setup build \
     -Dlibplacebo:vulkan=disabled \

ci/build-mingw64.sh

@@ -6,7 +6,7 @@ ln -snf . "$prefix_dir/usr"
 ln -snf . "$prefix_dir/local"
 
 wget="wget -nc --progress=bar:force"
-gitclone="git clone --depth=1 --recursive"
+gitclone="git clone --depth=1 --recursive --shallow-submodules"
 
 # -posix is Ubuntu's variant with pthreads support
 export CC=$TARGET-gcc-posix

ci/build-openbsd.sh

@@ -5,7 +5,8 @@ set -e
 rm -rf subprojects
 mkdir -p subprojects
 git clone https://code.videolan.org/videolan/libplacebo.git \
-    --depth 1 --recurse-submodules subprojects/libplacebo
+    --recurse-submodules --shallow-submodules \
+    --depth=1 --recurse-submodules subprojects/libplacebo
 
 meson setup build \
     -Dlibmpv=true \