[PATCH wayland] wl_strtol and wl_strtoul utility functions are added

[Imran Zaman]

Hi

The patch is used to replace strtol and strtoul with wl_strtol and
wl_strtoul with inputs and result checks.

The utility functions are used extensively in wayland and weston so added
appropriate
input and output checks; test cases are also updated; will push the patch
for weston as well.

BR
imran
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