testing/horizon: fix comparison for non x86 archs

/home/buildozer/aports/testing/horizon/src/horizon-0.9.6/./3rdparty/json.hpp:8494:24: error: comparison is always true due to limited range of data type [-Werror=type-limits]
 8494 |             if ('\x00' <= c and c <= '\x1F')
      |                 ~~~~~~~^~~~
[ 97%] Linking CXX executable hscript-image
7 jobs for !16963 with testing/horizon in 2 minutes and 16 seconds
latest detached
Status Job ID Name Coverage
  Lint
failed #296362
docker-alpine x86_64 allowed to fail
lint

00:00:20

 
  Build
failed #296367
docker-alpine ci-build aarch64
build-aarch64

00:00:48

failed #296368
docker-alpine ci-build armv7
build-armv7

00:00:57

passed #296366
docker-alpine ci-build ppc64le
build-ppc64le

00:01:54

passed #296365
docker-alpine ci-build s390x
build-s390x

00:00:48

passed #296364
docker-alpine ci-build x86
build-x86

00:00:51

failed #296363
docker-alpine ci-build x86_64
build-x86_64

00:00:22

 
Name Stage Failure
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lint Lint
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build-armv7 Build
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build-x86_64 Build
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build-aarch64 Build
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