gcc pass2: --disable-libsanitizer is no longer strictly needed

GCC 14 libsanitizer no longer depends on crypt.h.  But let's keep this
option for reducing build time, just update the explanation.

Also remove libxcrypt from GCC depedency list.

appendices/dependencies.xml

@@ -935,7 +935,7 @@
         <segtitle>&dependencies;</segtitle>
         <seglistitem>
           <seg>Bash, Binutils, Coreutils, Diffutils, Findutils, Gawk, GCC,
-          Gettext, Glibc, GMP, Grep, Libxcrypt, M4, Make, MPC, MPFR, Patch,
+          Gettext, Glibc, GMP, Grep, M4, Make, MPC, MPFR, Patch,
           Perl, Sed, Tar, Texinfo, and Zstd</seg>
         </seglistitem>
       </segmentedlist>
@@ -1887,7 +1887,7 @@
       <segmentedlist id="libxcrypt-before">
         <segtitle>&before;</segtitle>
         <seglistitem>
-          <seg>GCC, Perl, Python, Shadow, and &systemd-udev;</seg>
+          <seg>Perl, Python, Shadow, and &systemd-udev;</seg>
         </seglistitem>
       </segmentedlist>
 

chapter06/gcc-pass2.xml

@@ -149,12 +149,10 @@ cd       build</userinput></screen>
         <term><parameter>--disable-libsanitizer</parameter></term>
         <listitem>
           <para>Disable GCC sanitizer runtime libraries.  They are not
-          needed for the temporary installation.  This switch is necessary
-          to build GCC without
-          <systemitem class='library'>libcrypt</systemitem> installed for
-          the target.  In <xref linkend='ch-tools-gcc-pass1'/> it was
-          implied by <parameter>--disable-libstdcxx</parameter>, but now we
-          have to explicitly pass it.</para>
+          needed for the temporary installation.  In
+          <xref linkend='ch-tools-gcc-pass1'/> it was implied by
+          <parameter>--disable-libstdcxx</parameter>, and now we can
+          explicitly pass it.</para>
         </listitem>
       </varlistentry>