main/luajit: fix gsub issue

See https://github.com/moonjit/moonjit/issues/86
7 jobs for !11019 with main/luajit_fix_gsub in 36 seconds
detached
Status Job ID Name Coverage
  Lint
passed #178692
docker-alpine x86_64
lint

00:00:23

 
  Build
failed #178697
docker-alpine ci-build aarch64
build-aarch64

00:00:06

failed #178698
docker-alpine ci-build armv7
build-armv7

00:00:08

failed #178696
docker-alpine ci-build ppc64le
build-ppc64le

00:00:10

failed #178695
docker-alpine ci-build s390x
build-s390x

00:00:04

failed #178694
docker-alpine ci-build x86
build-x86

00:00:07

failed #178693
docker-alpine ci-build x86_64
build-x86_64

00:00:07

 
Name Stage Failure
failed
build-s390x Build
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build-x86_64 Build
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build-x86 Build
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build-aarch64 Build
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build-armv7 Build
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build-ppc64le Build
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