[bazel] Add -lbsd for lldb on Linux (#156954)

In the case you link libedit statically with a vendored sysroot, this
flag is also required. It should be harmless in the case you link it
dynamically since libedit already links libbsd otherwise.

Author: keith

utils/bazel/llvm-project-overlay/lldb/BUILD.bazel

@@ -62,6 +62,14 @@ selects.config_setting_group(
     ],
 )
 
+selects.config_setting_group(
+    name = "needs_libbsd",
+    match_all = [
+        ":libedit_enabled_setting",
+        "@platforms//os:linux",
+    ],
+)
+
 _VERSION_SUBSTITUTIONS = {
     "@LLDB_VERSION@": PACKAGE_VERSION,
     "@LLDB_VERSION_MAJOR@": LLVM_VERSION_MAJOR,
@@ -562,6 +570,11 @@ cc_library(
             "-ledit",
         ],
         "//conditions:default": [],
+    }) + select({
+        ":needs_libbsd": [
+            "-lbsd",
+        ],
+        "//conditions:default": [],
     }),
     deps = [
         ":Headers",