Update .gitattributes to force some line ending style for some file.

Fix cygwin not able to process 'configure' when fetched on windows directly.

.gitattributes

@@ -2,4 +2,11 @@
 *.c      diff=cpp
 *.sln    merge=union
 *.vcproj merge=union
-*.vcxproj merge=union
+*.vcxproj merge=union
+*.sln text eol=crlf
+*.bat text eol=crlf
+configure text eol=lf
+configure.in text eol=lf
+Makefile text eol=lf
+Makefile.in text eol=lf
+*.sh text eol=lf