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Add detection of LLD to build tool

--- a/tool

+++ b/tool

@@ -105,6 +105,7 @@

 # This is not perfect by any means

 cc_id=

 cc_vers=

+lld_detected=0

 if cc_vers_string=$("$cc_exe" --version 2> /dev/null); then

   if clang_vers_string=$(echo "$cc_vers_string" | grep clang | head -n1) && ! [[ -z $clang_vers_string ]]; then

     cc_id=clang

@@ -111,6 +112,11 @@

     # clang -dumpversion always pretends to be gcc 4.2.1

     # shellcheck disable=SC2001

     cc_vers=$(echo "$clang_vers_string" | sed 's/.*version \([0-9]*\.[0-9]*\.[0-9]*\).*/\1/')

+    if [[ $os != mac ]]; then

+      if command -v "lld" >/dev/null 2>&1; then

+        lld_detected=1

+      fi

+    fi

   # Only gcc has -dumpfullversion

   elif cc_vers=$("$cc_exe" -dumpfullversion 2> /dev/null); then

     cc_id=gcc

@@ -151,6 +157,9 @@

   local source_files=()

   local out_exe

   add cc_flags -std=c99 -pipe -Wall -Wpedantic -Wextra -Wconversion -Werror=implicit-function-declaration -Werror=implicit-int -Werror=incompatible-pointer-types -Werror=int-conversion

+  if [[ $lld_detected = 1 ]]; then

+    add cc_flags -fuse-ld=lld

+  fi

   if [[ $protections_enabled = 1 ]]; then

     add cc_flags -D_FORTIFY_SOURCE=2 -fstack-protector-strong -fpie -Wl,-pie

   fi

@@ -217,11 +226,18 @@

 }

 print_info() {

-cat <<EOF

+  local linker_name

+  if [[ $lld_detected = 1 ]]; then

+    linker_name=LLD

+  else

+    linker_name=default

+  fi

+  cat <<EOF

 Operating system: $os

 Compiler name:    $cc_exe

 Compiler type:    $cc_id

 Compiler version: $cc_vers

+Linker:           $linker_name

 EOF

 }