Move large file source def to code

Makefile

@@ -10,7 +10,7 @@ INSTALL_PREFIX = dist
 RUNTIME_ASSERT = true
 
 # Internal variables
-override CFLAGS              = -Wall -Wextra -Werror -pedantic -Isrc -D_LARGEFILE64_SOURCE
+override CFLAGS              = -Wall -Wextra -Werror -pedantic -Isrc
 override LIBFLAGS            = -fPIC
 override CSTD               := -std=gnu11
 override CXXSTD             := -std=gnu++11

src/os/file/posix/file_posix.c

@@ -16,6 +16,7 @@
 #define lseek64 lseek
 #endif // !WAPP_PLATFORM_APPLE
 
+#define __USE_LARGEFILE64
 #include <fcntl.h>
 #include <unistd.h>
 #include <sys/types.h>