[glib] docs: Remove mention of disable-regex

[Emmanuele Bassi <ebassi src gnome org>]

commit b1c7d2433f54cc3919722391335529002613ffd3
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Mon Jan 1 13:16:24 2018 +0000

    docs: Remove mention of disable-regex
    
    The `--disable-regex` configuration option was removed with commit
    d7063452 from 2012.

 docs/reference/glib/building.xml |   12 ------------
 1 files changed, 0 insertions(+), 12 deletions(-)
---
diff --git a/docs/reference/glib/building.xml b/docs/reference/glib/building.xml
index 492b5ed..ce63081 100644
--- a/docs/reference/glib/building.xml
+++ b/docs/reference/glib/building.xml
@@ -331,18 +331,6 @@
     </formalpara>
 
     <formalpara>
-      <title><systemitem>--disable-regex</systemitem> and
-        <systemitem>--enable-regex</systemitem></title>
-
-      <para>
-        Do not compile GLib with regular expression support.
-        GLib will be smaller because it will not need the
-        PCRE library. This is however not recommended, as
-        programs may need GRegex.
-      </para>
-    </formalpara>
-
-    <formalpara>
       <title><systemitem>--with-pcre</systemitem></title>
 
       <para>