libxml2 needs gcc11 dep for installs to succeed (#6261)

* add gcc11 dep to libxml2

* requested changes

* Add gcc11 to core

packages/buildessential.rb

@@ -14,7 +14,7 @@ class Buildessential < Package
 
   # install first to get ldconfig
   depends_on 'glibc'
-  depends_on 'gcc11'
+  # depends_on 'gcc11'
   depends_on 'gmp'
   depends_on 'mpfr'
   depends_on 'mpc'

packages/core.rb

@@ -20,6 +20,7 @@ class Core < Package
   depends_on 'expat'
   depends_on 'filecmd'
   depends_on 'flex'
+  depends_on 'gcc11'
   depends_on 'gdbm'
   depends_on 'gettext'
   depends_on 'git'

packages/libxml2.rb

@@ -24,6 +24,7 @@ class Libxml2 < Package
 
   depends_on 'zlibpkg'
   depends_on 'readline'
+  depends_on 'gcc11'
 
   def self.patch
     # Fix encoding.c:1961:31: error: ‘TRUE’ undeclared (first use in this function)

tools/core_packages.txt

@@ -13,6 +13,7 @@ expat
 filecmd
 flex
 gdbm
+gcc11
 gettext
 git
 glibc