Merge pull request #78 from tvegas1/fix_kernel_config_cflags

BUILD: Restore using default CFLAGS for kernel checks

Author: tvegas1

m4/ac_kernel_checks.m4

@@ -159,7 +159,7 @@ AC_DEFUN([AC_KERNEL_CHECK_SUPPORT],
                            -e s/s390x/s390/)
   save_CFLAGS="$CFLAGS"
   save_CPPFLAGS="$CPPFLAGS"
-  CFLAGS="$KERNEL_CHECKS_CFLAGS"
+  CFLAGS="${KERNEL_CHECKS_CFLAGS:--g -O2}"
   CPPFLAGS="-include $kernelinc/include/linux/kconfig.h \
             -include $kernelinc/include/linux/compiler.h \
             -D__KERNEL__ \