[libxslt] Use AC_PATH_TOOL to find libgcrypt-config and xml2-config

[Nick Wellnhofer <nwellnhof src gnome org>]

commit 8df3ccba4f1840eb8d11467e27c50d6018e932c5
Author: Michał Górny <mgorny gentoo org>
Date:   Wed Sep 3 11:21:01 2014 +0200

    Use AC_PATH_TOOL to find libgcrypt-config and xml2-config
    
    Using AC_PATH_TOOL prefers ${CHOST}-prefixed tools over 'bare' ones,
    therefore improving support for cross-compilation and multilib. This
    is useful for environment where libgcrypt-config and xml2-config
    correspond to the build host environment, while
    ${CHOST}-libgcrypt-config and ${CHOST}-xml2-config are installed for
    each supported build targets.
    
    Fixes: https://bugzilla.gnome.org/show_bug.cgi?id=725635
    Fixes: https://bugs.gentoo.org/show_bug.cgi?id=518728

 configure.in |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/configure.in b/configure.in
index fabaf56..e84ad4f 100644
--- a/configure.in
+++ b/configure.in
@@ -393,7 +393,7 @@ case $host in
     CRYPTO_TESTDIR=crypto
     ;;
   *)
-    AC_PATH_PROG(LIBGCRYPT_CONFIG, libgcrypt-config, no)
+    AC_PATH_TOOL(LIBGCRYPT_CONFIG, libgcrypt-config, no)
     if test "$LIBGCRYPT_CONFIG" != "no" ; then
       LIBGCRYPT_VERSION=`$LIBGCRYPT_CONFIG --version`
       if test VERSION_TO_NUMBER(echo $LIBGCRYPT_VERSION) -lt VERSION_TO_NUMBER(echo "1.1.42")
@@ -507,9 +507,9 @@ AC_SUBST(LIBXML_REQUIRED_VERSION)
 AC_MSG_CHECKING(for libxml libraries >= $LIBXML_REQUIRED_VERSION) 
 if test "x$LIBXML_CONFIG_PREFIX" != "x"
 then
-       XML_CONFIG=${LIBXML_CONFIG_PREFIX}/bin/xml2-config
+       AC_PATH_TOOL([XML_CONFIG], [xml2-config], [false], [${LIBXML_CONFIG_PREFIX}/bin])
 else
-       XML_CONFIG=xml2-config
+       AC_PATH_TOOL([XML_CONFIG], [xml2-config], [false])
 fi
 
 dnl