Don't inline ifstream destructor

Alc/compat.h

@@ -76,10 +76,10 @@ public:
     ifstream(const wchar_t *filename, std::ios_base::openmode mode = std::ios_base::in);
     ifstream(const std::wstring &filename, std::ios_base::openmode mode = std::ios_base::in)
       : ifstream(filename.c_str(), mode) { }
-
     ifstream(const char *filename, std::ios_base::openmode mode = std::ios_base::in);
     ifstream(const std::string &filename, std::ios_base::openmode mode = std::ios_base::in)
       : ifstream(filename.c_str(), mode) { }
+    ~ifstream() override;
 
     bool is_open() const noexcept { return mStreamBuf.is_open(); }
 };

Alc/helpers.cpp

@@ -424,6 +424,12 @@ ifstream::ifstream(const char *filename, std::ios_base::openmode mode)
         clear(failbit);
 }
 
+/* This is only here to ensure the compiler doesn't define an implicit
+ * destructor, which it tries to automatically inline and subsequently complain
+ * it can't inline without excessive code growth.
+ */
+ifstream::~ifstream() { }
+
 } // namespace al
 
 const PathNamePair &GetProcBinary()