[xml] Build warning info for OSX (Darwin 7.5) and libxml 2.6.13

[Jose Commins <axora myrealbox com>]

	Hi, here's a heads-up on the warnings I get on building libxml 2.6.13 
on Mac OSX (Darwin 7.5) with gcc:

        Thread model: posix
        gcc version 3.3 20030304 (Apple Computer, Inc. build 1666)


encoding.c: In function `xmlIconvWrapper':
encoding.c:1665: warning: passing arg 2 of `libiconv' from incompatible 
pointer type

parser.c: In function `xmlParseEndTag2':
parser.c:7639: warning: pointer targets in passing arg 1 of `strncmp' 
differ in signedness

h.Tpo -c xpath.c  -fno-common -DPIC -o .libs/xpath.o
In file included from trionan.c:43,
                 from xpath.c:70:
triodef.h:154: warning: use of `long double' type; its size may change 
in a future release
triodef.h:154: warning: (Long double usage is reported only once for 
each file.
triodef.h:154: warning: To disable this warning, use -Wno-long-double.)
trionan.c:115: warning: `rcsid' defined but not used
trionan.c:217: warning: `trio_is_negative' defined but not used

xmlstring.c: In function `xmlStrncmp':
xmlstring.c:212: warning: pointer targets in passing arg 1 of `strncmp' 
differ in signedness
xmlstring.c:212: warning: pointer targets in passing arg 2 of `strncmp' 
differ in signedness

xmlcatalog.c: In function `usage':
xmlcatalog.c:310: warning: string length `637' is greater than the 
length `509' ISO C89 compilers are required to support



Regards,
                Jose.