Enhance build-libraries.sh and env.sh for toolchain integration

- Updated build-libraries.sh to consistently use the --toolchain flag for environment registration and unregistration.
- Modified env.sh to clarify usage instructions and enforce the --toolchain option for environment setup, improving user experience and consistency in toolchain management.

build-libraries.sh

@@ -10,7 +10,7 @@ INSTALL_DIR="${TOP}/build/install"
 INSTALL_BIN_DIR="${INSTALL_DIR}/bin"
 
 # Запускаем предварительно для того чтобы подтянуть переменные
-. ./env.sh --register "${INSTALL_DIR}"
+. ./env.sh --toolchain --register "${INSTALL_DIR}"
 
 # Сбрасываем CFLAGS/CXXFLAGS — все флаги уже встроены в CC/CXX
 export CFLAGS=""
@@ -78,7 +78,7 @@ echo "== Распаковка завершена =="
 # ==================================================================
 
 cd ${TOP}
-. ./env.sh --register "${INSTALL_DIR}" "rc"
+. ./env.sh --toolchain --register "${INSTALL_DIR}" "rc"
 export CFLAGS=""
 export CXXFLAGS=""
 
@@ -90,7 +90,7 @@ make install
 # ==================================================================
 
 cd ${TOP}
-. ./env.sh --register "${INSTALL_DIR}"
+. ./env.sh --toolchain --register "${INSTALL_DIR}"
 export CFLAGS=""
 export CXXFLAGS=""
 
@@ -174,4 +174,4 @@ make install
 # ==================================================================
 
 cd ${TOP}
-. ./env.sh --unregister
+. ./env.sh --toolchain --unregister