🔨 fixed a pedantic warning

.gitignore

@@ -7,6 +7,7 @@ fuzz-testing
 *.gcno
 *.gcda
 
+ndk
 build
 working
 

test/src/unit-unicode.cpp

@@ -34,6 +34,7 @@ using nlohmann::json;
 
 #include <fstream>
 
+extern size_t calls;
 size_t calls = 0;
 
 void check_utf8string(bool success_expected, int byte1, int byte2, int byte3, int byte4);