fix: do not restrict gclient sync to the target platform deps

--deps=android drops the host DEPS entries along with the other
platforms', and the linux sysroot hook is one of them. gn gen then fails
with "Missing sysroot (//build/linux/debian_bullseye_amd64-sysroot)" for
//build/toolchain/linux:clang_x64 -- the host toolchain torque and
mksnapshot are built with, which every Android target needs.

target_os in .gclient already selects the target deps; keeping the host
ones as well is the point.

Author: edusperoni

scripts/matrix/fetch.sh

@@ -63,7 +63,13 @@ elif ! grep -q "'$PLATFORM'" .gclient; then
 fi
 
 checkpoint "Syncing"
-gclient sync --deps="$PLATFORM" --reset --with_branch_head \
+# No --deps here on purpose. Restricting the DEPS OS list to the target platform
+# also drops the *host* entries, and the linux sysroot hook is one of them --
+# which then fails gn gen with "Missing sysroot
+# (//build/linux/debian_bullseye_amd64-sysroot)" for the host toolchain that
+# torque and mksnapshot are built with. target_os in .gclient already selects
+# the target deps, and additionally keeping the host ones is what we want.
+gclient sync --reset --with_branch_head \
     --revision "$V8_VERSION" --delete_unversioned_trees
 
 checkpoint "Patching"