Define strlcpy only on platforms where it's not available

Signed-off-by: David Heidelberg <david@ixit.cz>

src/CMakeLists.txt

@@ -695,6 +695,8 @@ endif()
 include(CheckCSourceCompiles)
 include(CheckSymbolExists)
 
+check_symbol_exists(strlcpy "string.h" HAVE_STRLCPY)
+
 set(CMAKE_REQUIRED_INCLUDES ${LUA_INCLUDE_DIR})
 if(USE_LUAJIT)
 	set(CMAKE_REQUIRED_LIBRARIES ${LUA_LIBRARY})

src/porting.h

@@ -70,20 +70,6 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 	#define strtok_r(x, y, z) mystrtok_r(x, y, z)
 #endif
 
-// strlcpy is missing from glibc.  thanks a lot, drepper.
-// strlcpy is also missing from AIX and HP-UX because they aim to be weird.
-// We can't simply alias strlcpy to MSVC's strcpy_s, since strcpy_s by
-// default raises an assertion error and aborts the program if the buffer is
-// too small.
-#if defined(__FreeBSD__) || defined(__NetBSD__)    || \
-	defined(__OpenBSD__) || defined(__DragonFly__) || \
-	defined(__APPLE__)   ||                           \
-	defined(__sun)       || defined(sun)           || \
-	defined(__QNX__)     || defined(__QNXNTO__)
-	#define HAVE_STRLCPY
-#endif
-
-// So we need to define our own.
 #ifndef HAVE_STRLCPY
 	#define strlcpy(d, s, n) mystrlcpy(d, s, n)
 #endif