[PATCH v5] improve code portability

[Tyler Retzlaff]

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

Remove use of designated initialization ranges (gcc extension). Instead
use a combination of a trivially initialized array and standard C isalnum.

v5:
  * declare allowed array static
  * fix alpha-numeric -> alphanumeric (ci warning)

v4:
  * Re-implement using isalnum and sparsely populated array.
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: remove non-portable array initialization syntax

 lib/telemetry/telemetry_data.c | 16 +++++++---------
 1 file changed, 7 insertions(+), 9 deletions(-)

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1.8.3.1