revert: complete unit tests in modular build structure

Author: alandefreitas

test/unit/Jamfile

@@ -51,6 +51,7 @@ local SOURCES =
     segments_encoded_view.cpp
     segments_ref.cpp
     segments_view.cpp
+    snippets.cpp
     static_url.cpp
     string_view.cpp
     url.cpp
@@ -62,6 +63,7 @@ local SOURCES =
     grammar/alnum_chars.cpp
     grammar/alpha_chars.cpp
     grammar/charset.cpp
+    grammar/ci_string.cpp
     grammar/dec_octet_rule.cpp
     grammar/delim_rule.cpp
     grammar/digit_chars.cpp