add Bison and flex build dependencies to SCOTCH 6.1.x

[branfosj]

(created using eb --new-pr)

Picked up from the failure in #15574 (comment)

(bison -pscotchyy -y -b y -d -v parser_yy.y &&      \
                 mv y.tab.c parser_yy.c &&      \
                 mv y.tab.h parser_ly.h) ||     \
                cp last_resort/parser_ly.h last_resort/parser_yy.c .

and

(flex -Pscotchyy -olex.yy.c parser_ll.l &&          \
                 mv lex.yy.c parser_ll.c) ||        \
                cp last_resort/parser_ll.c .

Though, this may not be needed in the older versions. The failure is

bison "-pscotchyy" --defines="parser_ly.h" --output="parser_yy.c" parser_yy.y
/bin/sh: bison: command not found

which seems to have lost the || cp ... part and that would explain why we've not seen this before now.

[boegel]

@boegelbot please test @ generoso

[boegelbot]

@boegel: Request for testing this PR well received on login1

PR test command 'EB_PR=15618 EB_ARGS= /opt/software/slurm/bin/sbatch --job-name test_PR_15618 --ntasks=4 ~/boegelbot/eb_from_pr_upload_generoso.sh' executed!

• exit code: 0
• output:

Submitted batch job 8657

Test results coming soon (I hope)...

Details

- notification for comment with ID 1146758611 processed

Message to humans: this is just bookkeeping information for me,
it is of no use to you (unless you think I have a bug, which I don't).

[boegel]

Test report by @boegel
SUCCESS
Build succeeded for 5 out of 5 (5 easyconfigs in total)
node3108.skitty.os - Linux RHEL 8.4, x86_64, Intel(R) Xeon(R) Gold 6140 CPU @ 2.30GHz (skylake_avx512), Python 3.6.8
See https://gist.github.com/d157c88867db4b99b034a207c4246745 for a full test report.

[boegel]

Hmm, test on generoso completed, but test report failed to upload (due to HTTP Error 403: Forbidden), I'll assume that's a fluke...

[boegel]

lgtm

[boegel]

Going in, thanks @branfosj!

[Micket]

Test report by @Micket
SUCCESS
Build succeeded for 5 out of 5 (5 easyconfigs in total)
alvis-c1 - Linux Rocky Linux 8.5, x86_64, Intel Xeon Processor (Skylake), Python 3.6.8
See https://gist.github.com/8f208151623f4067a67a1c95992e5ddd for a full test report.