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

@@ -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?