Allow build time --with-cflags option to work - #123
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The current extconfg.rb overwrites $CFLAGS variable breaking usual gem -- --with-cflags="..." way of setting it
Fix build, added cflags need padding
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The current extconfg.rb overwrites
$CFLAGSvariable breaking usualgem install zstd-ruby -- --with-cflags="..."way of setting itI ran into this when trying to compile the gem with musl on arm64 where a
PATH_MAXconstant is not set, and couldn't getgemcommand to add it to the generated makefile with--with-cflagsAs a workaround
--with-cppflags="..."works because that is already with+=in extconf, but i see no reason why break normal cflags