Make icu.hpp header only.

test/Jamfile.v2

@@ -61,7 +61,6 @@ test_operators.cpp
 ;
 
 lib boost_regex_recursive :    
-   ../src/icu.cpp
    ../src/posix_api.cpp
    ../src/regex.cpp
    ../src/regex_debug.cpp

test/captures/Jamfile.v2

@@ -8,7 +8,6 @@ project
     ;
 
 EX_SOURCES = 
-   icu.cpp
    posix_api.cpp
    regex.cpp
    regex_debug.cpp

test/noeh_test/Jamfile.v2

@@ -24,7 +24,6 @@ project
 
 
 lib boost_regex_noeh :    
-   ../../src/icu.cpp
    ../../src/posix_api.cpp
    ../../src/regex.cpp
    ../../src/regex_debug.cpp

test/test_consolidated.cpp

@@ -10,7 +10,6 @@
  */
 
 
-#include <libs/regex/src/icu.cpp>
 #include <libs/regex/src/posix_api.cpp>
 #include <libs/regex/src/regex.cpp>
 #include <libs/regex/src/regex_debug.cpp>