PR other/46789
PR bootstrap/46812
* go-lang.c (go_char_p): Define type and vectors.
(go_search_dirs): New static variable.
(go_langhook_handle_option): Use version and version/machine
directories for -L.
(go_langhook_post_options): Add non-specific -L paths.
* Make-lang.in (go/go-lang.o): Define DEFAULT_TARGET_VERSION and
DEFAULT_TARGET_MACHINE when compiling.
* gccgo.texi (Invoking gccgo): Only document -L for linking.
(Import and Export): Don't mention -L for finding import files.
libgo: Install .gox files in version and target specific directory.
From-SVN: r167537
