[Bug binutils/20343] Document how to use LTO

[markus at trippelsdorf dot de]

https://sourceware.org/bugzilla/show_bug.cgi?id=20343

--- Comment #4 from Markus Trippelsdorf <markus at trippelsdorf dot de> ---
There is no need to use an explicit --plugin option.

On my system:

 % strace ar cr a.a a.o
...
open("/usr/x86_64-pc-linux-gnu/binutils-bin/git/../git/../lib/bfd-plugins",
O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = 6
fstat(6, {st_mode=S_IFDIR|0755, st_size=66, ...}) = 0
getdents(6, /* 4 entries */, 32768)     = 128
stat("/usr/x86_64-pc-linux-gnu/binutils-bin/git/../git/../lib/bfd-plugins/.",
{st_mode=S_IFDIR|0755, st_size=66, ...}) = 0
stat("/usr/x86_64-pc-linux-gnu/binutils-bin/git/../git/../lib/bfd-plugins/..",
{st_mode=S_IFDIR|0755, st_size=22, ...}) = 0
stat("/usr/x86_64-pc-linux-gnu/binutils-bin/git/../git/../lib/bfd-plugins/liblto_plugin.so.0.0.0",
{st_mode=S_IFREG|0755, st_size=83976, ...}) = 0
open("/usr/x86_64-pc-linux-gnu/binutils-bin/git/../git/../lib/bfd-plugins/liblto_plugin.so.0.0.0",
O_RDONLY|O_CLOEXEC) = 7

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