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
x86_64 docker-alpine
lint

00:00:23

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

00:00:06

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

00:00:08

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

00:00:10

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

00:00:04

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

00:00:07

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

00:00:07

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