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Some subtargets don't provide the canonical function names as the symbol name in C libraries, and libcalls will only work if the builtins are patched to emit the correct library name. For example, on NetBSD, cabsl has the symbol name __c99_cabsl, and the patching is done via netbsd_patch_builtin. With this change, libgfortran.so is correctly built with a reference to __c99_cabsl, instead of "cabsl" which is not defined. gcc/ChangeLog: * config/aarch64/aarch64.c (aarch64_init_builtins): Call SUBTARGET_INIT_BUILTINS.
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