Refactor build-libraries.sh and env.sh for improved environment setup

- Updated build-libraries.sh to use --global and --path options for environment registration, enhancing clarity and consistency.
- Modified env.sh to support custom paths and improved error handling for the --path argument, streamlining toolchain path resolution.
- Removed redundant SYSROOT_DIR assignments to simplify the script logic.

env.sh

@@ -1,15 +1,31 @@
 TOP="$(pwd)"
 TOOLCHAIN_PATH=""
 GLOBAL_MODE=0
+CUSTOM_PATH=""
 
-for arg in "$@"; do
-    if [ "$arg" = "--global" ]; then
-        GLOBAL_MODE=1
-        break
-    fi
+while [ $# -gt 0 ]; do
+    case "$1" in
+        --global)
+            GLOBAL_MODE=1
+            shift
+            ;;
+        --path)
+            if [ -z "$2" ]; then
+                echo "Ошибка: для --path нужно указать путь"
+                return 1 2>/dev/null || exit 1
+            fi
+            CUSTOM_PATH="$2"
+            shift 2
+            ;;
+        *)
+            shift
+            ;;
+    esac
 done
 
-if [ -d "${TOP}/arm-uclinuxfdpiceabi" ]; then
+if [ -n "${CUSTOM_PATH}" ]; then
+    TOOLCHAIN_PATH="${CUSTOM_PATH}"
+elif [ -d "${TOP}/arm-uclinuxfdpiceabi" ]; then
     TOOLCHAIN_PATH="${TOP}/arm-uclinuxfdpiceabi"
 elif [ -d "${TOP}/build/install" ]; then
     TOOLCHAIN_PATH="${TOP}/build/install"