Get rid of explicit ErrorInfo constructors

src/libexpr/attr-set.hh

src/libexpr/eval-inline.hh

src/libexpr/eval.cc

src/libexpr/nixexpr.cc

src/libexpr/nixexpr.hh

src/libexpr/parser.y

src/libexpr/primops.cc

src/libexpr/primops/context.cc

src/libexpr/primops/fetchGit.cc

src/libexpr/primops/fetchMercurial.cc

src/libexpr/primops/fetchTree.cc

src/libexpr/primops/fromTOML.cc

src/libstore/builtins/buildenv.cc

src/libstore/gc.cc

src/libstore/sqlite.cc

src/libutil/error.hh

src/libutil/serialise.cc

src/nix-build/nix-build.cc

src/nix/upgrade-nix.cc