refactor(makefile): add PCRE_INCDIR variable

[drgnchan]

Description

Fixes #8432

Checklist

• I have explained the need for this PR and the problem it solves
• I have explained the changes or the new features added to this PR
• I have added tests corresponding to this change
• I have updated the documentation to reflect this change
• I have verified that this change is backward compatible (If not, please discuss on the APISIX mailing list first)

[drgnchan]

I have tested with Linux and Darwin:

1. rm -rf deps
2. rm ~/.luarocks/config-5.1.lua
3. rerun make deps

Finally both linux and darwin install jsonschema(requeir pcre) successfully.

[drgnchan]

I am not sure why the CI job build (ubuntu-20.04, linux_openresty_1_19, t/plugin/[a-k]*) succeeded but build (ubuntu-20.04, linux_openresty, t/plugin/[a-k]*) failed.And I think the difference of the two job is the openresty version.

[tzssangglass]

the failed CI CI Centos7 / run ci on centos7 (t/node t/pubsub t/router t/script t/stream-node t/utils t/wasm t/xds-library) (pull_request) has been fixed by #8438, pls merge upstream master branch to your PR.

[tzssangglass]

hi @drgnchan I think you are mistaken, your PR has other people's commits in it.

[tzssangglass]

pls follow the git follow: https://apisix.apache.org/docs/general/contributor-guide/#create-your-branch

[drgnchan]

@tzssangglass I am sorry having made the wrong workflow before.I just sync fork by Github and I think it is ok now.

[github-actions]

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[Sn0rt]

LGTM

the branch has been tested at a M2 machine.

[monkeyDluffy6017]

@Sn0rt Thanks