* intnum.h (yasm_get_sleb128, yasm_size_sleb128): New functions to handle

* intnum.h (yasm_get_sleb128, yasm_size_sleb128): New functions to handle
signed LEB128-encoded numbers straight from long values (rather than going
through intnum).
(yasm_get_uleb128, yasm_size_uleb128): Likewise, for unsigned LEB128.
* intnum.c (get_leb128, size_leb128): Move most of functionality here from:
(yasm_intnum_get_leb128, yasm_intnum_size_leb128): Here (refactor).
(yasm_get_sleb128, yasm_size_sleb128, yasm_get_uleb128, yasm_size_uleb128):
Implement using refactored functionality.

svn path=/trunk/yasm/; revision=1366