[libxml2] Fix zlib and lzma libraries check via command line

[Daniel Veillard <veillard src gnome org>]

commit 7dc24965092d7cc310908d6052913050e88ec072
Author: Dmitriy <aweioklds gmail com>
Date:   Tue Oct 7 18:59:00 2014 +0800

    Fix zlib and lzma libraries check via command line
    
    For https://bugzilla.gnome.org/show_bug.cgi?id=737532
    
    add save, change and restore LDFLAGS before AC_CHECK_LIB call
    when functions gzread and lzma_code are searching inside action-if-found
    of AC_CHECK_HEADERS

 configure.in |   10 ++++++++--
 1 files changed, 8 insertions(+), 2 deletions(-)
---
diff --git a/configure.in b/configure.in
index f0a62ea..6bb1a52 100644
--- a/configure.in
+++ b/configure.in
@@ -391,6 +391,8 @@ if test "$with_zlib" = "no"; then
     echo "Disabling compression support"
 else
     AC_CHECK_HEADERS(zlib.h,
+        [SAVE_LDFLAGS="${LDFLAGS}"
+        LDFLAGS="-L${Z_DIR}/lib"
        AC_CHECK_LIB(z, gzread,[
            AC_DEFINE([HAVE_LIBZ], [1], [Have compression library])
            WITH_ZLIB=1
@@ -404,7 +406,8 @@ else
                esac]
            else
                Z_LIBS="-lz"
-           fi]))
+           fi])
+        LDFLAGS="${SAVE_LDFLAGS}"])
 fi
 
 AC_SUBST(Z_CFLAGS)
@@ -430,6 +433,8 @@ else
      # private dependencies, though, so static linking may fail.
      if test "x$have_liblzma" = "xno"; then
          AC_CHECK_HEADERS(lzma.h,
+           [SAVE_LDFLAGS="${LDFLAGS}"
+            LDFLAGS="-L${LZMA_DIR}/lib"
             AC_CHECK_LIB(lzma, lzma_code,[
                 have_liblzma=yes
                 if test "x${LZMA_DIR}" != "x"; then
@@ -438,7 +443,8 @@ else
                 else
                     LZMA_LIBS="-llzma"
                 fi],
-                [have_liblzma=no]))
+                [have_liblzma=no])
+            LDFLAGS="${SAVE_LDFLAGS}"])
     fi
 
     # Found the library via either method?