Clarify patch intent.

We need to remove the BOM because old compilers choke on it (ex.: gcc 4.3.4)

component/tesseract/tesseract-3.01-remove-bom.patch

 The patch below removes a utf-8 BOM mark.
 
-Avoid touching it as the BOM is invisible, and copy/pasting might not work
+Avoid touching it as the BOM is invisible, and copy/pasting might not work.
+
+It is needed because old compilers treat the BOM as garbage instead of
+whitespace.
 
 --- tesseract-3.01/ccutil/strngs.h.orig	2012-05-24 15:13:22.743808379 +0200
 +++ tesseract-3.01/ccutil/strngs.h	2012-05-24 15:16:54.468858282 +0200