Take care of two Clang warnings.

README.chromium

 Name: icu
 URL: http://site.icu-project.org/
 Version: 4.6
 
 Description:
 This directory contains the source code of ICU 4.6 for C/C++
 
 1. It was obtained with the following:
 
     $ svn export --native-eol LF http://source.icu-project.org/repos/icu/icu/tags/release-4-6 icu46
@@ skipping 115 matching lines @@
   - patches/vscomp.patch
     (see http://bugs.icu-project.org/trac/ticket/8355 and
          http://bugs.icu-project.org/trac/ticket/8356 )
   - patches/rtti.patch : Make RTTI work without exception handling on Windows
     (see http://bugs.icu-project.org/trac/ticket/8343)
   - patches/data.build.patch :
       To remove some data files we don't use and cut down the data size.
   - patches/data.build.win.patch :
       Windows-only data build patch. Add a new target DATALIB to makedata.mak
   - patches/clang.patch: To build with Clang.
+    (see http://bugs.icu-project.org/trac/ticket/8954 Two other chunks in
+    the patch have already been fixed in the ICU trunk.)
   - add an empty file (stubdatabuilt.txt) to source/stubdata
 
 10. Pre-built data libraries are checked in.
 
     Before building data file on Linux, re-run runConfigureICU Linux again
     if it's run without data.build.patch in #8 above.
 
     'make' will fail in the 1st pass. Copy source/data/in/coll/invuca.icu
     to {BUILD_DIR_ROOT}/data/out/build/icudt46l/coll and re-run 'make'
     in {BUILD_DIR_ROOT}/data.
@@ skipping 61 matching lines @@
     and common/uresbund.c 
    - patches/uloc.patch
    - upstream bug: 
      1. http://bugs.icu-project.org/trac/ticket/8984 (_canonicalize)
      2. http://bugs.icu-project.org/trac/ticket/9114 (_getKeywords)
      3. http://bugs.icu-project.org/trac/ticket/yyyy (uresbund)
 
 20. Fix a null pointer error in ubrk_setText in ubrk.cpp.
     - patches/ubrk.patch
     - upstream bug : http://bugs.icu-project.org/trac/ticket/9115