squid: Remove buildpaths from generated binaries
Compiler invocation and flags are added to SQUID_CONFIGURE_OPTIONS which
is added via generated autoconf.h during configure step. Since OE
encodes sysroot and buildpaths for cross compile, they end up in squid
binary, this patch removes from workdir from them so avoid encoding
build workspace path
Signed-off-by: Khem Raj <raj.khem@gmail.com>