CMake: add boost_message_value as counterpart of boost_report_value.

The new function does not pass value through colormsg which
eats semi-colon and other CMake control characters.

[ci skip]

cmake/SociBackend.cmake

@@ -337,7 +337,7 @@ macro(soci_backend_test)
       endif()
     endif()
 
-    boost_report_value(${TEST_CONNSTR_VAR})
+    boost_message_value(${TEST_CONNSTR_VAR})
 
     if( SOCI_SHARED )
       # Shared libraries test

cmake/SociUtilities.cmake

@@ -301,6 +301,14 @@ function(boost_report_value NAME)
   colormsg("${NAME}${varpadding} = ${${NAME}}")
 endfunction()
 
+function(boost_message_value NAME)
+  string(LENGTH "${NAME}" varlen)
+  math(EXPR padding_len 40-${varlen})
+  string(SUBSTRING "                                      "
+    0 ${padding_len} varpadding)
+  message(STATUS "${NAME}${varpadding} = ${${NAME}}")
+endfunction()
+
 function(trace NAME)
   if(BOOST_CMAKE_TRACE)
     string(LENGTH "${NAME}" varlen)