got rid of test-only Directive constructor

lib/preprocessor.cpp

@@ -51,12 +51,6 @@ Directive::Directive(const simplecpp::Location & _loc, std::string _str) :
     str(std::move(_str))
 {}
 
-Directive::Directive(std::string _file, const int _linenr, std::string _str) :
-    file(std::move(_file)),
-    linenr(_linenr),
-    str(std::move(_str))
-{}
-
 Directive::DirectiveToken::DirectiveToken(const simplecpp::Token & _tok) :
     line(_tok.location.line),
     column(_tok.location.col),

lib/preprocessor.h

@@ -69,7 +69,6 @@ struct CPPCHECKLIB Directive {
 
     /** record a directive (possibly filtering src) */
     Directive(const simplecpp::Location & _loc, std::string _str);
-    Directive(std::string _file, int _linenr, std::string _str);
 };
 
 class CPPCHECKLIB RemarkComment {

test/testunusedvar.cpp

@@ -1632,7 +1632,10 @@ class TestUnusedVar : public TestFixture {
 
     void structmember15() { // #3088
         std::list<Directive> directives;
-        directives.emplace_back("test.cpp", 1, "#pragma pack(1)");
+        std::vector<std::string> f = { "test.cpp" };
+        simplecpp::Location loc(f);
+        loc.line = 1;
+        directives.emplace_back(loc, "#pragma pack(1)");
         checkStructMemberUsage("\nstruct Foo { int x; int y; };", dinit(CheckStructMemberUsageOptions, $.directives = &directives));
         ASSERT_EQUALS("", errout_str());
     }