make-mod-scripts: add HOSTCXX definitions and gmp-native dependency
With kernel v5.8+ and gcc10 plugins, we can run into the following build error:
HOSTCXX -fPIC scripts/gcc-plugins/arm_ssp_per_task_plugin.o
In file included from
/home/pokybuild/yocto-worker/qemuarm/build/build/tmp/work/qemuarm-poky-linux-gnueabi/make-mod-scripts/1.0-r0/recipe-sysroot-native/usr/bin/arm-poky-linux-gnueabi/../../lib/arm-poky-linux-gnueabi/gcc/arm-poky-linux-gnueabi/10.1.0/plugin/include/gcc-plugin.h:28,
from
/home/pokybuild/yocto-worker/qemuarm/build/build/tmp/work-shared/qemuarm/kernel-source/scripts/gcc-plugins/gcc-common.h:7,
from
/home/pokybuild/yocto-worker/qemuarm/build/build/tmp/work-shared/qemuarm/kernel-source/scripts/gcc-plugins/arm_ssp_per_task_plugin.c:3:
/home/pokybuild/yocto-worker/qemuarm/build/build/tmp/work/qemuarm-poky-linux-gnueabi/make-mod-scripts/1.0-r0/recipe-sysroot-native/usr/bin/arm-poky-linux-gnueabi/../../lib/arm-poky-linux-gnueabi/gcc/arm-poky-linux-gnueabi/10.1.0/plugin/include/system.h:687:10:
fatal error: gmp.h: No such file or directory
687 | #include <gmp.h>
| ^~~~~~~
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
