huffman.c macros

I was building this on Solaris and noticed the macros for PTR and V only 
work for little-endian or gcc compilers. So I made a few changes, below 
are the macros rewritten for more portability:

for huffquad

# if defined(__GNUC__) || (__SUNPRO_C >= 0x556)
#  define PTR(offs, bits)	{ .ptr =   { 0, bits, offs       } }
#  define V(v, w, x, y, hlen)	{ .value = { 1, hlen, v, w, x, y } }
#elif defined(WORDS_BIGENDIAN)
#  define PTR(offs, bits)	{ { 0, bits, offs } }
#  define V(v, w, x, y, hlen)	{ { 1, hlen, (v << 11) | (w << 10) |  \
                                              (x << 9) | (y << 8) } }
#else
#  define PTR(offs, bits)	{ { 0, bits, offs } }
#  define V(v, w, x, y, hlen)	{ { 1, hlen, (v << 0) | (w << 1) |  \
                                              (x << 2) | (y << 3) } }
# endif

for huffpair

# if defined(__GNUC__) || (__SUNPRO_C >= 0x556)
#  define PTR(offs, bits)	{ .ptr=   { 0, bits, offs } }
#  define V(x, y, hlen)		{ .value= { 1, hlen, x, y } }
# elif defined(WORDS_BIGENDIAN)
#  define PTR(offs, bits)	{ { 0, bits, offs } }
#  define V(x, y, hlen)		{ { 1, hlen, (x << 8) | (y << 4) } }
# else
#  define PTR(offs, bits)	{ { 0, bits, offs } }
#  define V(x, y, hlen)		{ { 1, hlen, (x << 0) | (y << 4) } }
# endif

instead of the ptr: and value: it uses the C99 designator syntax, also 
I've changed the shifts for big-endian.

obviously the WORDS_BIGENDIAN needs to come from the config.h.

regards,
Ian