Ensure unix line ends for configure.ac

On windows, configure.ac needs to have unix line ends if you want to run
autogen.sh (see #10053). It is no poblem to force unix line ends, since
you need to run autogen.sh under mingw or cygwin shell anyway, and if you
neither have mingw nor cygwin, then configure.ac is of no use for you.

diff --git a/.gitattributes b/.gitattributes
new file mode 100644 (file)
index 0000000..51a1fc9
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,3 @@
+# configure.ac needs to have unix line ends on windows, see #10053
+configure.ac eol=lf
+