Some autotool files (configure.ac) expect host build flags to be
defined as BUILD_CFLAGS, BUILD_CXXFLAGS, BUILD_CPPFLAGS and
BUILD_LDFLAGS. Especially these files tend to default to
LDFLAGS for BUILD_LDFLAGS, which makes host utilities built
with these flags fail with buildpie=yes because of differing
compiler and linker options.
One example is libatasmart where this patch fixes the build.
6a25cf1cf2