Explained what this patch does

git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@913 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

chapter05/gcc-exp.xml

@@ -1,6 +1,9 @@
 <sect2>
 <title>Command explanations</title>
 
+<para><userinput>patch -Np1 -i ../gcc-&gcc-version;.patch:</userinput>
+This patch fixes a bug in gcc's linker concerning non-exported (weak) 
+symbols, which was brought to the surface by the new glibc.</para>
 
 <para><userinput>--enable-languages=c,c++:</userinput> This only builds the C
 and C++ compilers and not the other available compilers as they are, on