Makes a binary diff of two strings and returns the result.
This function works with both text and binary data. Resulting patch
can be later applied using xdiff_string_bpatch()/xdiff_file_bpatch().
Parameters
old_data
First string with binary data. It acts as "old" data.
new_data
Second string with binary data. It acts as "new" data.
Return Values
Returns string with binary diff containing differences between "old" and "new"
data or FALSE if an internal error occured.