wdiff fixen

[Duncan Simpson]

The following patch to wdiff addresses the following minor problems

1. Adds a better check for tputs to configure.in
2. Avoids problem with redeclaring strstr (Linux 2.2.9 with glibc 2.2)
3. Changes type of main() to int
4. Possible double fclosing of input_file (which leads to core dumps).

Finally it adds secure temporary file creation with tmpfile ands mkstemp. This 
change also knows about the TMPDIR environment variable.

BTW unified context diffs, with ~3 words context by default, would be a useful 
extension IMHO.

Duncan (-:

wdiff.fix
Description: wdiff.fix

Duncan (-:
"software industry, the: unique industry where selling substandard goods is
legal and you can charge extra for fixing the problems."