Ensure using otool that framework linking actually happened

tests/run-make/link-framework/Makefile

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+# only-macos
+#
+# Check that linking to a framework actually makes it to the linker.
+
+include ../tools.mk
+
+all:
+	$(RUSTC) dep-link-framework.rs
+	$(RUSTC) dep-link-weak-framework.rs
+
+	$(RUSTC) empty.rs
+	otool -L $(TMPDIR)/no-link | $(CGREP) -v CoreFoundation
+
+	$(RUSTC) link-framework.rs
+	otool -L $(TMPDIR)/link-framework | $(CGREP) CoreFoundation | $(CGREP) -v weak
+
+	$(RUSTC) link-weak-framework.rs
+	otool -L $(TMPDIR)/link-weak-framework | $(CGREP) CoreFoundation | $(CGREP) weak
+
+# When linking the framework both normally, and weakly, the weak linking takes preference
+
+	$(RUSTC) link-both.rs
+	otool -L $(TMPDIR)/link-both | $(CGREP) CoreFoundation | $(CGREP) weak

tests/run-make/link-framework/dep-link-framework.rs

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+#![crate_type = "rlib"]
+
+#[link(name = "CoreFoundation", kind = "framework")]
+extern "C" {}

tests/run-make/link-framework/dep-link-weak-framework.rs

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+#![crate_type = "rlib"]
+#![feature(link_arg_attribute)]
+
+#[link(name = "-weak_framework", kind = "link-arg", modifiers = "+verbatim")]
+#[link(name = "CoreFoundation", kind = "link-arg", modifiers = "+verbatim")]
+extern "C" {}

tests/run-make/link-framework/empty.rs

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+fn main() {}

tests/run-make/link-framework/link-both.rs

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+extern crate dep_link_framework;
+extern crate dep_link_weak_framework;
+
+fn main() {}

tests/run-make/link-framework/link-framework.rs

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+extern crate dep_link_framework;
+
+fn main() {}

tests/run-make/link-framework/link-weak-framework.rs

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+extern crate dep_link_weak_framework;
+
+fn main() {}