perl: Add packageconfig for setlocale functionality differences

perl: Add packageconfig for setlocale functionality differences

setlocale behavior with 'missing' locales is different when using musl
[1] which confuses perl locale tests and perl thinks it has locale on
system while there are none. Therefore pass correct property on musl
regarding setlocale behaviour

[1] https://musl.openwall.narkive.com/kO1vpTWJ/setlocale-behavior-with-missing-locales

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>