Use integer constants for filesystem magic values.

Apparently, some of the magic constant macros are not defined on some
systems (specifically, in Ubuntu 18.04). Just use literal constants
instead.

Author: Lastique

src/operations.cpp

@@ -984,13 +984,9 @@ int check_fs_type(int infile, int outfile, uintmax_t size, std::size_t blksize)
 
         if (BOOST_UNLIKELY(sfs.f_type == PROC_SUPER_MAGIC ||
             sfs.f_type == SYSFS_MAGIC ||
-#if defined(CGROUP2_SUPER_MAGIC)
-            sfs.f_type == CGROUP2_SUPER_MAGIC ||
-#endif
-#if defined(CGROUP_SUPER_MAGIC)
-            sfs.f_type == CGROUP_SUPER_MAGIC ||
-#endif
-            sfs.f_type == SECURITYFS_MAGIC ||
+            sfs.f_type == 0x63677270 || // CGROUP2_SUPER_MAGIC
+            sfs.f_type == 0x0027e0eb || // CGROUP_SUPER_MAGIC
+            sfs.f_type == 0x73636673 || // SECURITYFS_MAGIC
             sfs.f_type == 0x62656570 || // CONFIGFS_MAGIC
             sfs.f_type == TRACEFS_MAGIC ||
             sfs.f_type == DEBUGFS_MAGIC))