Remove unused std.Buffer imports

build.zig

@@ -6,7 +6,6 @@ const BufMap = std.BufMap;
 const warn = std.debug.warn;
 const mem = std.mem;
 const ArrayList = std.ArrayList;
-const Buffer = std.Buffer;
 const io = std.io;
 const fs = std.fs;
 const InstallDirectoryOptions = std.build.InstallDirectoryOptions;

lib/std/build/run.zig

@@ -9,7 +9,6 @@ const mem = std.mem;
 const process = std.process;
 const ArrayList = std.ArrayList;
 const BufMap = std.BufMap;
-const Buffer = std.Buffer;
 const warn = std.debug.warn;
 
 const max_stdout_size = 1 * 1024 * 1024; // 1 MiB

src-self-hosted/main.zig

@@ -9,7 +9,6 @@ const mem = std.mem;
 const process = std.process;
 const Allocator = mem.Allocator;
 const ArrayList = std.ArrayList;
-const Buffer = std.Buffer;
 
 const c = @import("c.zig");
 const introspect = @import("introspect.zig");