[PATCH v3] improve code portability

[Tyler Retzlaff]

Improve portability of telemetry code to allow it to be compiled by msvc
unconditionally.

Remove use of ranged based initializer (a gcc extension). Instead initialize
using for loops over [0..9] [A..Z] [a..z] [_/] on first call.

v3:
  * Move int index declaration to top of function
  * Fix typo 'Z' -> 'z' in last for loop
v2:
  * Initialize valid character array using for loop instead of explicit
    initialization of each element.
  * Drop patch removing VLAs, in a separate series a conditionally compiled
    change will be introduced.

Tyler Retzlaff (1):
  telemetry: use portable syntax to initialize array

 lib/telemetry/telemetry_data.c | 22 +++++++++++++++-------
 1 file changed, 15 insertions(+), 7 deletions(-)

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1.8.3.1