Add -F to allowed prefixes

Co-authored-by: Carlo Cabrera <30379873+carlocab@users.noreply.github.com>

Library/Homebrew/keg_relocate.rb

@@ -12,7 +12,7 @@ class Keg
   class Relocation
     extend T::Sig
 
-    RELOCATABLE_PATH_REGEX_PREFIX = /(?:(?<=-I|-L|-isystem)|(?<![a-zA-Z0-9]))/.freeze
+    RELOCATABLE_PATH_REGEX_PREFIX = /(?:(?<=-F|-I|-L|-isystem)|(?<![a-zA-Z0-9]))/.freeze
 
     def initialize
       @replacement_map = {}