Alan Modra 47523653a3 Check for shared lib support before running ld tests with -shared
Another fix now that we run these tests non-native.

	* testsuite/ld-elf/audit.exp: Check for shared lib support.
	* testsuite/ld-elf/compress.exp: Likewise.
	* testsuite/ld-elf/dwarf.exp: Likewise.
	* testsuite/ld-elf/shared.exp: Likewise.
	* testsuite/ld-elf/wrap.exp: Likewise.
	* testsuite/ld-ifunc/ifunc.exp: Likewise.
	* testsuite/ld-plugin/lto.exp: Check $CXX exists.
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