[PATCH] tools: Fix removal of COPYING and .gitignore

[Viresh Kumar <viresh.kumar@xxxxxxxxxx>]

The Makefile continues to remove the entire tools/include/xen/ directory
on "make clean", which isn't the right thing to do anymore since this
file contains files like COPYING and .gitignore now.

Since there are only two files at the moment, use "xen/[a-z]*" regex to
remove everything else.

Fixes: 4ea75e9a9058 ("Rework COPYING installed in /usr/include/xen/, due to 
several licences")
Signed-off-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
---
I got into trouble as my build script does a "make clean" before building
everything again and so build fails without the COPYING file.

Based of:

https://xenbits.xen.org/gitweb/?p=people/julieng/xen-unstable.git;a=shortlog;h=refs/heads/for-next/4.18

 tools/include/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/include/Makefile b/tools/include/Makefile
index f838171e8cd5..2ca344cba521 100644
--- a/tools/include/Makefile
+++ b/tools/include/Makefile
@@ -84,7 +84,7 @@ install: all
 
 .PHONY: clean
 clean:
-       rm -rf xen xen-xsm acpi
+       rm -rf xen/[a-z]* xen-xsm acpi
        $(MAKE) -C xen-foreign clean
        rm -f _*.h
 
-- 
2.31.1.272.g89b43f80a514