Make tests pass on busybox (#912)

-t option to ln is not defined under POSIX and (at least) busybox does
not implement it. Rewrite the code to use only POSIX options to ln.

foreign_cc/private/framework/toolchains/linux_commands.bzl

@@ -139,7 +139,7 @@ if [[ -f "$1" ]]; then
     dest="$target/$(basename \"$1\")"
     cp "$1" "$dest" && chmod +w "$dest" && touch -r "$1" "$dest"
   else
-    ln -s -f -t "$target" "$1"
+    ln -sf "$1" "$target/${1##*/}"
   fi
 elif [[ -L "$1" && ! -d "$1" ]]; then
   cp -pR "$1" "$2"

test/convert_shell_script_test.bzl

@@ -216,9 +216,9 @@ def _symlink_to_dir(source, target):
 mkdir -p ${target}
 
 if [[ -d $1 ]]; then
-  ln -s -t ${target} $1
+  ln -s "$1" "$target/${1##*/}"
 elif [[ -f $1 ]]; then
-  ln -s -t ${target} $1
+  ln -s "$1" "$target/${1##*/}"
 elif [[ -L $1 ]]; then
   cp --no-target-directory $1 ${target}
 else
@@ -249,9 +249,9 @@ local target="$2"
 mkdir -p ${target}
 
 if [[ -d $1 ]]; then
-ln -s -t ${target} $1
+ln -s "$1" "$target/${1##*/}"
 elif [[ -f $1 ]]; then
-ln -s -t ${target} $1
+ln -s "$1" "$target/${1##*/}"
 elif [[ -L $1 ]]; then
 cp --no-target-directory $1 ${target}
 else

test/expected/inner_fun_text.txt

@@ -43,7 +43,7 @@ if [[ "$1" == *.pc || "$1" == *.la || "$1" == *-config || "$1" == *.mk || "$1" =
 dest="$target/$(basename "$1")"
 cp "$1" "$dest" && chmod +w "$dest" && touch -r "$1" "$dest"
 else
-ln -s -f -t "$target" "$1"
+ln -sf "$1" "$target/${1##*/}"
 fi
 elif [[ -L "$1" && ! -d "$1" ]]; then
 cp -pR "$1" "$2"