Ensure that the single header is kept with LFs

.gitattributes

@@ -8,4 +8,8 @@
 *.hpp text
 
 # Windows specific files should retain windows line-endings
-*.sln text eol=crlf
+*.sln text eol=crlf
+
+# Keep the single include header with LFs to make sure it is uploaded,
+# hashed etc with LF
+single_include/*.hpp eol=lf

scripts/generateSingleHeader.py

@@ -46,7 +46,7 @@ def generate(v):
     outDir = os.path.dirname(outputPath)
     if not os.path.exists(outDir):
         os.makedirs(outDir)
-    out = open( outputPath, 'w' )
+    out = open( outputPath, 'w', newline='\n' )
 
     def write( line ):
         if globals['includeImpl'] or globals['implIfDefs'] == -1: