[xmlsec] [patch] configure check for libxml2/libxslt prepends /bin

[Michael Stahl]

hi libxmlsec maintainers,

the check for the xml2-config/xslt-config programs in configure (as of
libxmlsec 1.2.14) is a bit suboptimal:

 	AC_PATH_PROG([LIBXML_CONFIG], [$LIBXML_CONFIG], [],
		     [$with_libxml/bin:$PATH])

if no --with-libxml parameter is given explicitly, it will prepend /bin to
$PATH (because $with_libxml is empty).
this is not usually a problem, except that on my Solaris box for some
reason there's a /bin/xml2-config and /bin/xslt-config  :(

attached patch fixed that for me.
[ note that i'm not a shell expert, but i've tested that the ${var:+foo}
construct works with Solaris old moldy /bin/sh and with Ubuntu /bin/dash ]

regards,
 michael

-- 
"To argue with a person who has renounced the use of reason is
 like administering medicine to the dead." -- Thomas Paine
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