add test for -Clink-self-contained consistency

Author: lqd

tests/ui/linkage-attr/link-self-contained-consistency.many.stderr

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+error: some `-C link-self-contained` components were both enabled and disabled: crto, linker
+

tests/ui/linkage-attr/link-self-contained-consistency.one.stderr

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+error: some `-C link-self-contained` components were both enabled and disabled: linker
+

tests/ui/linkage-attr/link-self-contained-consistency.rs

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+// Checks that self-contained linking components cannot be both enabled and disabled at the same
+// time on the CLI.
+
+// check-fail
+// revisions: one many
+// [one] compile-flags: -Clink-self-contained=-linker -Clink-self-contained=+linker -Zunstable-options
+// [many] compile-flags: -Clink-self-contained=+linker,+crto -Clink-self-contained=-linker,-crto -Zunstable-options
+// ignore-tidy-linelength
+
+fn main() {}