Bug 899722 Part 4: Prevent runConfigureICU from overriding CC/CXX on BSDs.

diff --git a/intl/icu/source/runConfigureICU b/intl/icu/source/runConfigureICU
--- a/intl/icu/source/runConfigureICU
+++ b/intl/icu/source/runConfigureICU
@@ -329,8 +329,6 @@ case $platform in
     *BSD)
         THE_OS="BSD"
         THE_COMP="the GNU C++"
-        CC=gcc; export CC
-        CXX=g++; export CXX
         DEBUG_CFLAGS='-g -O0'
         DEBUG_CXXFLAGS='-g -O0'
         ;;