bash: Remove bash_cv_strtold_broken=no workaround

It's no longer needed for bash-5.2.37, the upstream has fixed the bug at
https://ftp.gnu.org/gnu/bash/bash-5.2-patches/bash52-033.

chapter06/bash.xml

@@ -48,8 +48,7 @@
 <screen><userinput remap="configure">./configure --prefix=/usr                      \
             --build=$(sh support/config.guess) \
             --host=$LFS_TGT                    \
-            --without-bash-malloc              \
-            bash_cv_strtold_broken=no</userinput></screen>
+            --without-bash-malloc</userinput></screen>
 
     <variablelist>
       <title>The meaning of the configure options:</title>

chapter08/bash.xml

@@ -45,7 +45,6 @@
     <screen><userinput remap="configure">./configure --prefix=/usr             \
             --without-bash-malloc     \
             --with-installed-readline \
-            bash_cv_strtold_broken=no \
             --docdir=/usr/share/doc/bash-&bash-version;</userinput></screen>
 
     <variablelist>