[XEN PATCH maybe for-4.17] tools/include: Fix clean and rework COPYING for installed Xen public header

[Anthony PERARD <anthony.perard@xxxxxxxxxx>]

Use actual include directory used to install the public header in
COPYING file.

Also, move the input file out of "tools/include/xen/" because that
directory is removed on `make clean`.

We can't used ./configure because $includedir contain another
variable, so the change is done in Makefile.

Fixes: 4ea75e9a9058 ("Rework COPYING installed in /usr/include/xen/, due to 
several licences")
Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
---

Notes:
    For 4.17 inclusion:
    
    Doing `make clean && make` in the root dir is going to fail as make
    isn't going to find the COPYING file while trying to install the
    includes.
    
    If that patch is too much, we could replace the `sed` by `cp` and just
    move COPYING instead of changing it.

 tools/include/Makefile                        | 1 +
 tools/include/{xen/COPYING => xen.COPYING.in} | 2 +-
 tools/include/.gitignore                      | 1 +
 tools/include/xen/.gitignore                  | 2 --
 4 files changed, 3 insertions(+), 3 deletions(-)
 rename tools/include/{xen/COPYING => xen.COPYING.in} (93%)
 create mode 100644 tools/include/.gitignore
 delete mode 100644 tools/include/xen/.gitignore

diff --git a/tools/include/Makefile b/tools/include/Makefile
index f838171e8c..d69aeb54bf 100644
--- a/tools/include/Makefile
+++ b/tools/include/Makefile
@@ -24,6 +24,7 @@ xen-foreign:
 xen-dir:
        mkdir -p xen/libelf acpi
        find xen/ acpi/ -type l -exec rm '{}' +
+       sed -e 's#@includedir@#$(includedir)/xen#g' xen.COPYING.in > xen/COPYING
        ln -s $(XEN_ROOT)/xen/include/public/*.h xen/
        ln -s $(XEN_ROOT)/xen/include/public/*/ xen/
        ln -s ../xen-sys/$(XEN_OS) xen/sys
diff --git a/tools/include/xen/COPYING b/tools/include/xen.COPYING.in
similarity index 93%
rename from tools/include/xen/COPYING
rename to tools/include/xen.COPYING.in
index fe3f9b7557..25513fe529 100644
--- a/tools/include/xen/COPYING
+++ b/tools/include/xen.COPYING.in
@@ -1,7 +1,7 @@
 XEN NOTICE
 ==========
 
-This licence applies to all files within this subdirectory ("/usr/include/xen")
+This licence applies to all files within this subdirectory ("@includedir@")
 with the exception of "sys/" which may include headers under different
 licences.
 
diff --git a/tools/include/.gitignore b/tools/include/.gitignore
new file mode 100644
index 0000000000..be14e3632d
--- /dev/null
+++ b/tools/include/.gitignore
@@ -0,0 +1 @@
+/xen/
diff --git a/tools/include/xen/.gitignore b/tools/include/xen/.gitignore
deleted file mode 100644
index 0628b2daf1..0000000000
--- a/tools/include/xen/.gitignore
+++ /dev/null
@@ -1,2 +0,0 @@
-*
-!COPYING
-- 
Anthony PERARD