Refactor env.sh to streamline environment variable exports

- Removed redundant export statements for environment variables in env.sh.
- Clarified default architecture and mode settings for improved readability.
- Enhanced output messages for better user feedback during environment activation.

env.sh

@@ -116,17 +116,12 @@ if [ $# -eq 0 ]; then
     CXXFLAGS_FOR_TARGET="${CFLAGS_TARGET}"
     PATH="${TOOLCHAIN_PATH}:${_ENV_ORIG_PATH}"
 
-    export TOP TARGET TOOLCHAIN TOOLCHAIN_PATH
+    SUBARCH=armv7-m
-    export CFLAGS_TOOLSET CFLAGS_TARGET
+    SUBMODE=thumb
-    export CFLAGS CFLAGS_FOR_TARGET CXXFLAGS_FOR_TARGET
-    export SUBARCH=armv7-m
-    export SUBMODE=thumb
-    export PATH
 
     echo "Окружение по умолчанию активировано"
     echo "   TOP    = $TOP"
     echo "   TARGET = $TARGET"
-    echo "   PATH   = $TOOLCHAIN_PATH:\$PATH"
     return 0 2>/dev/null || exit 0
 fi