Build error: vecimpl.h:124:98: error: expected declaration specifiers or '...' before string constant

Also:

• configure: remove cython check for petsc4py - as cython is also built during petsc4py build process

• makefile: fix PETSC_CCOMPILE_SINGLE to accept CFLAGS

added workflowIn-Development label

requested review from @BarrySmith and @Jfaibussowitsch

approved this merge request

Hold this MR, I may have a fix that does not require this message.

approved this merge request

resolved all threads

added 2 commits

• b5c0d8a4 - Build error: vecimpl.h:124:98: error: expected declaration specifiers or...
• cc5a890f - configure: remove cython check for petsc4py - as cython is also built during petsc4py build process

Compare with previous version

changed title from document user makefile change wrt CFLAGS , build fixes to Build error: vecimpl.h:124:98: error: expected declaration specifiers or '...' before string constant

changed the description

changed milestone to %v3.23-release-fixes

added workflowReview label and removed workflowIn-Development label

requested review from @knepley

I pushed additional fix - perhaps @knepley, @Jfaibussowitsch can re-review

resolved all threads

added workflowReady-For-Merge label and removed workflowReview label

mentioned in commit 95e8dc3c

merged