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Update extern linking documentation

In particular, remove the note saying cdylibs can't link against dylibs — that hasn't been true for over four years. * 2019年11月07日: note is written: b54e8ec * 2020年01月23日: restriction is lifted (without updating docs): 72aaa3a

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src/doc/rustc/src/codegen-options
- index.md

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`‎src/doc/rustc/src/codegen-options/index.md‎`

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Original file line number	Diff line number	Diff line change
@@ -410,13 +410,16 @@ See also the [`no-prepopulate-passes`](#no-prepopulate-passes) flag.
`410`	`410`
`411`	`411`	By default, `rustc` prefers to statically link dependencies. This option will
`412`	`412`	`indicate that dynamic linking should be used if possible if both a static and`
`413`		`-dynamic versions of a library are available. There is an internal algorithm`
`414`		`-for determining whether or not it is possible to statically or dynamically`
`415`		-link with a dependency. For example, `cdylib` crate types may only use static
`416`		`-linkage. This flag takes one of the following values:`
	`413`	`+dynamic versions of a library are available.`
`417`	`414`
`418`		-* `y`, `yes`, `on`, `true` or no value: use dynamic linking.
`419`		-* `n`, `no`, `off` or `false`: use static linking (the default).
	`415`	`+There is [an internal algorithm](https://github.com/rust-lang/rust/blob/master/compiler/rustc_metadata/src/dependency_format.rs)`
	`416`	`+for determining whether or not it is possible to statically or dynamically link`
	`417`	`+with a dependency.`
	`418`	`+`
	`419`	`+This flag takes one of the following values:`
	`420`	`+`
	`421`	+* `y`, `yes`, `on`, `true` or no value: prefer dynamic linking.
	`422`	+* `n`, `no`, `off` or `false`: prefer static linking (the default).
`420`	`423`
`421`	`424`	`## profile-generate`
`422`	`425`

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`‎src/doc/rustc/src/codegen-options/index.md‎`

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