Linux fixes. Don't support c89 for now

Because // comments are diagnosed and I can't be bothered

ConflictSet.cpp

@@ -1,8 +1,9 @@
 #include "ConflictSet.h"
 
+#include <algorithm>
 #include <cassert>
 #include <compare>
-#include <memory>
+#include <cstring>
 #include <random>
 #include <span>
 #include <string_view>
@@ -818,6 +819,10 @@ __attribute__((__visibility__("default"))) void ConflictSet_destroy(void *cs) {
 }
 }
 
+namespace std {
+void __throw_length_error(const char *) { abort(); }
+} // namespace std
+
 #ifdef ENABLE_TESTS
 int main(void) {
   int64_t writeVersion = 0;