Add a reason for CFLAGS

Author: oech3

util/build-gnu.sh

@@ -131,6 +131,7 @@ else
     # Disable useless checks
     "${SED}" -i 's|check-texinfo: $(syntax_checks)|check-texinfo:|' doc/local.mk
     ./bootstrap --skip-po
+    # Use CFLAGS for best build time since we discard GNU coreutils
     CFLAGS="${CFLAGS} -pipe -O0 -s" ./configure --quiet --disable-gcc-warnings --disable-nls --disable-dependency-tracking --disable-bold-man-page-references \
       "$([ "${SELINUX_ENABLED}" = 1 ] && echo --with-selinux || echo --without-selinux)"
     #Add timeout to to protect against hangs