Leave dlopen()ed .so version to CFLAGS

Index: src/libredirect.c
--- src/libredirect.c.orig
+++ src/libredirect.c
@@ -127,8 +127,6 @@ static void log_line(const char *fmt, ...)
 
 static void load_lib(void)
 {
-#define LIBPCSC "libpcsclite_real.so.1"
-
 	const char *lib;
 
 	lib = SYS_GetEnv("LIBPCSCLITE_DELEGATE");
