Clear out .gitattributes file

Git 2.18 supports the `working-tree-encoding`. This means that anyone
who checks out the codebase with the new git will get a working tree
in EBCDIC.

This patch removes the forced encoding. Build will still work on z/OS
due to file-tagging and auto-conversion.

Signed-off-by: Devin Nakamura <devinn@ca.ibm.com>

.gitattributes

@@ -3,17 +3,6 @@
 # when cloned using git (from Rocket Software) on z/OS platform.
 #
 # Selected binary files will not be translated at all.
-#
-# The default for text files
-* git-encoding=iso8859-1 working-tree-encoding=iso8859-1
-
-# git's files (which MUST be ASCII)
-.gitattributes git-encoding=iso8859-1 working-tree-encoding=iso8859-1
-.gitignore git-encoding=iso8859-1 working-tree-encoding=iso8859-1
-
-# omr files that need to be encoded as EBCDIC
-*.hdf git-encoding=iso8859-1 working-tree-encoding=ibm-1047
-*.tdf git-encoding=iso8859-1 working-tree-encoding=ibm-1047
 
 # Binary files
 *.jpg git-encoding=BINARY working-tree-encoding=BINARY