linux: fix mips boot decompressor build

Replace the now defunct 062-mips_decompressor_build_fix.patch with another
patch that simply undefines the arch memset and memcpy defines to avoid
syntax errors in the redeclaration.

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@44223 3c298f89-4303-0410-b956-a3cf2f4a3e73