www/varnish7: Use upstream release archive and some improvements to port
65541efda3e8
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Description

www/varnish7: Use upstream release archive and some improvements to port

Use upstream release archive as recommended by USE_GITHUB section in Porters Handbook
Remove USES= compiler as there's no need to modify configure script
Remove unneeded gmake and readline dependency definitions
Use USES= localbase instead of CFLAGS variable
Remove REINPLACE_CMD for GCC
Rearrange Makefile to follow Porters Handbook more closely and improve readability

PR: 266467
Reviewed by: dbaio (maintainer)