core_read: Replace boost::split with SplitString

Note that `SplitString` doesn't support token compression, but in this case
it does not matter as empty strings are already skipped anyways.

Also removes split.hpp and classification.hpp from expected includes

src/core_read.cpp

@@ -14,9 +14,6 @@
 #include <util/strencodings.h>
 #include <version.h>
 
-#include <boost/algorithm/string/classification.hpp>
-#include <boost/algorithm/string/split.hpp>
-
 #include <algorithm>
 #include <string>
 
@@ -66,12 +63,11 @@ CScript ParseScript(const std::string& s)
 {
     CScript result;
 
-    std::vector<std::string> words;
-    boost::algorithm::split(words, s, boost::algorithm::is_any_of(" \t\n"), boost::algorithm::token_compress_on);
+    std::vector<std::string> words = SplitString(s, " \t\n");
 
     for (const std::string& w : words) {
         if (w.empty()) {
-            // Empty string, ignore. (boost::split given '' will return one word)
+            // Empty string, ignore. (SplitString doesn't combine multiple separators)
         } else if (std::all_of(w.begin(), w.end(), ::IsDigit) ||
                    (w.front() == '-' && w.size() > 1 && std::all_of(w.begin() + 1, w.end(), ::IsDigit)))
         {

test/lint/lint-includes.py

@@ -22,9 +22,7 @@ EXCLUDED_DIRS = ["src/leveldb/",
                  "src/univalue/"]
 
 EXPECTED_BOOST_INCLUDES = ["boost/algorithm/string.hpp",
-                           "boost/algorithm/string/classification.hpp",
                            "boost/algorithm/string/replace.hpp",
-                           "boost/algorithm/string/split.hpp",
                            "boost/date_time/posix_time/posix_time.hpp",
                            "boost/multi_index/hashed_index.hpp",
                            "boost/multi_index/ordered_index.hpp",