prevent distro default LPATH from interfering

Attach patch unsets LPATH flag (found configured in some custom host
distributions) to make OpenWRT compile its toolchain without any issues.
LPATH is used on some distros to define the linkers search path.

Signed-off-by: Tathagata Das <tathagata@alumnux.com>

SVN-Revision: 31203

include/toplevel.mk

@@ -33,6 +33,9 @@ unexport QUILT_PATCHES QUILT_PATCH_OPTS
 
 unexport C_INCLUDE_PATH
 
+# prevent distro default LPATH from interfering
+unexport LPATH
+
 # make sure that a predefined CFLAGS variable does not disturb packages
 export CFLAGS=