Oops, forgot we need to use the root boost project settings when building.

[SVN r41119]

tools/regression/build/Jamroot.jam

@@ -31,6 +31,7 @@ obj tiny_xml
     :
     <define>BOOST_ALL_NO_LIB=1
     <define>_CRT_SECURE_NO_WARNINGS
+    <use>/boost//headers
     :
     release
     ;
@@ -44,6 +45,7 @@ exe process_jam_log
     :
     <define>BOOST_ALL_NO_LIB=1
     <define>_CRT_SECURE_NO_WARNINGS
+    <use>/boost//headers
     :
     release
     ;
@@ -56,6 +58,7 @@ exe compiler_status
     /boost/filesystem//boost_filesystem/<link>static
     :
     <define>BOOST_ALL_NO_LIB=1
+    <use>/boost//headers
     :
     release
     ;
@@ -68,6 +71,7 @@ exe library_status
     /boost/filesystem//boost_filesystem/<link>static
     :
     <define>BOOST_ALL_NO_LIB=1
+    <use>/boost//headers
     :
     release
     ;