itstool: Fix python3 interpreter passed to configure

itstool's buildsystem makes a bad use of the PYTHON variable, it should
try to resolve it to a full path before writting it as interpreter to
the itstool script; for now just pass a full path.

Fixes: 1c7ad47f0765 ("itstool: Fix python3 dependency check")

1 files changed, 1 insertions, 1 deletions

diff --git a/doc/itstool/BUILD b/doc/itstool/BUILD
index 4725c8e835..e0fca5e012 100755
--- a/doc/itstool/BUILD
+++ b/doc/itstool/BUILD
@@ -1,4 +1,4 @@
 if is_depends_enabled "$SPELL" python3; then
-  export PYTHON=python3
+  export PYTHON=/usr/bin/python3
 fi &&
 default_build