[gn check] Unbreak check-lld if llvm_install_binutils_symlinks is false

[thakis]

Summary

The check-lld target was missing the dependency on llvm-nm and llvm-objdump in that case.

[phosek]

LGTM

llvm/utils/gn/secondary/llvm/tools/llvm-nm/BUILD.gn

 import("//llvm/tools/binutils_symlinks.gni")
 import("//llvm/utils/gn/build/symlink_or_copy.gni")
 
 if (llvm_install_binutils_symlinks) {
   symlink_or_copy("nm") {
     deps = [
       ":llvm-nm",
     ]
     source = "llvm-nm"
     output = "$root_out_dir/bin/nm"
   }
 }
 
 # //:llvm-nm depends on this symlink target, see comment in //BUILD.gn.
 group("symlinks") {
-  if (llvm_install_binutils_symlinks) {
-    deps = [
-      ":nm",
-    ]
+    ":llvm-nm",
+  if (llvm_install_binutils_symlinks) {
+    deps += [ ":nm" ]
   }
 }
 
 executable("llvm-nm") {
   deps = [
     "//llvm/lib/Bitcode/Reader",
     "//llvm/lib/Demangle",
     "//llvm/lib/IR",

llvm/utils/gn/secondary/llvm/tools/llvm-objdump/BUILD.gn

 import("//llvm/tools/binutils_symlinks.gni")
 import("//llvm/utils/gn/build/symlink_or_copy.gni")
 
 if (llvm_install_binutils_symlinks) {
   symlink_or_copy("objdump") {
     deps = [
       ":llvm-objdump",
     ]
     source = "llvm-objdump"
     output = "$root_out_dir/bin/objdump"
   }
 }
 
 # //:llvm-nm depends on this symlink target, see comment in //BUILD.gn.
 group("symlinks") {
-  if (llvm_install_binutils_symlinks) {
-    deps = [
-      ":objdump",
-    ]
+    ":llvm-objdump",
+  if (llvm_install_binutils_symlinks) {
+    deps += [ ":objdump" ]
   }
 }
 
 executable("llvm-objdump") {
   deps = [
     "//llvm/include/llvm/Config:config",
     "//llvm/lib/CodeGen",
     "//llvm/lib/DebugInfo/DWARF",