This reverts commit 87bd69c6.

in case of resolve file corruption.
Use of lexer functions.

Reduce use of HEAP memory with
the stack_xxx functions familly.
Switch to the new lexer algorithm.
Fix the parse of the @runas key.

to internal version_compare and version_store respectively.

Some distribution do not leave an empty live directory at exit of the initramfs.
In case of existing directory, the -m option remount the live directory excluding the MS_NOEXEC flag.