Add dummy author info in case none is configured (#36)

This is currently needed when the script is executed in a virgin environment as
git needs this to create the "initial commit" in the
build_sysroot/prepare_sysroot_src.sh script.

Author: dkm

build_sysroot/prepare_sysroot_src.sh

@@ -20,6 +20,13 @@ git init
 echo "[GIT] add"
 git add .
 echo "[GIT] commit"
+
+# This is needed on virgin system where nothing is configured.
+# git really needs something here, or it will fail.
+# Even using --author is not enough.
+git config user.email || git config user.email "none@example.com"
+git config user.name || git config user.name "None"
+
 git commit -m "Initial commit" -q
 for file in $(ls ../../patches/ | grep -v patcha); do
 echo "[GIT] apply" $file