Update gen_kpp.c

[vergillovedante]

there is a mistake in official file gen_kpp.c, their gen_kpp.c 's function definition order is reserved! So when you make there is a report of error:implicit function: write_list_to_screen,screen_out,check_all 官方很多WRF版本的chem下面的/chem/KPP/util/wkc/gen_kpp.c都是错的（直到2023.4.27最新版的WRF里面的这个都还是错的），因为他把函数顺序给放反了，把write_list_to_screen跟screen_out还有check_all都放在最下面了，而gen_kpp函数却放在最上面，所以就会导致报错函数没有定义，因此需要将原文件里面的函数顺序换一下，把write_list_to_screen等3个函数放到gen_kpp的上面，在我的这里是已经修改好的gen_kpp.c文件，下载后替换即可

TYPE: bug fix

KEYWORDS: kpp,gen_kpp,/chem/KPP/util/wkc/gen_kpp.c

SOURCE:https://github.com/vergillovedante this is my homepage on github email is vergillovedante@outlook.com

DESCRIPTION OF CHANGES:
Problem:one of the the file's of kpp's functions' sequence is wrong

Solution:replace gen_kpp.c with my uploaded file

ISSUE: Fixes:001 -provided by lxy(vergillovedante)

RELEASE NOTE: Include a stand-alone message suitable for the inclusion in the minor and annual releases. A publication citation is appropriate.

The first line should be a single-line "purpose" for this change

TYPE: choose one of [bug fix, enhancement, new feature, feature removed, no impact, text only]

KEYWORDS: 5 to 10 words related to commit, separated by commas

SOURCE: Either "developer's name (affiliation)" .XOR. "internal" for a WRF Dev committee member

DESCRIPTION OF CHANGES:
Problem:
Generally or specifically, what was wrong and needed to be addressed?

Solution:
What was down algorithmically and in the source code to address the problem?

ISSUE: For use when this PR closes an issue.
Fixes wrf-model#123

LIST OF MODIFIED FILES: list of changed files (use git diff --name-status master to get formatted list)

TESTS CONDUCTED:

1. Do mods fix problem? How can that be demonstrated, and was that test conducted?
2. Are the Jenkins tests all passing?

RELEASE NOTE: Include a stand-alone message suitable for the inclusion in the minor and annual releases. A publication citation is appropriate.