Fix fatal error: errno.h: No such file or directory in ./build-modules --arch aarch64

```
make -C '/home/ciro/bak/git/linux-kernel-module-cheat/out/linux/default/aarch64' M='/home/ciro/bak/git/linux-kernel-module-cheat/out/kernel_modules/aarch64/kernel_modules'
make[1]: Entering directory '/mnt/sda3/linux-kernel-module-cheat-out/linux/default/aarch64'
  CC [M]  /home/ciro/bak/git/linux-kernel-module-cheat/out/kernel_modules/aarch64/kernel_modules/dump_regs.o
In file included from /home/ciro/bak/git/linux-kernel-module-cheat/lkmc/aarch64_dump_regs.h:4,
                 from /home/ciro/bak/git/linux-kernel-module-cheat/out/kernel_modules/aarch64/kernel_modules/dump_regs.c:8:
/home/ciro/bak/git/linux-kernel-module-cheat/lkmc.h:10:10: fatal error: errno.h: No such file or directory
 #include <errno.h>
          ^~~~~~~~~
```

Fix https://github.com/cirosantilli/linux-kernel-module-cheat/issues/127

lkmc/aarch64_dump_regs.h

@@ -1,8 +1,6 @@
 #ifndef LKMC_AARCH64_DUMP_REGS_H
 #define LKMC_AARCH64_DUMP_REGS_H
 
-#include <lkmc.h>
-
 /* https://cirosantilli.com/linux-kernel-module-cheat#dump-regs */
 
 /* So that a sigle source will work with baremetal and printk from kernel module. */
@@ -19,7 +17,7 @@
 #endif
 
 /* Dump registers that are only visible from privileged levels of the system. */
-void lkmc_dump_system_regs() {
+void lkmc_dump_system_regs(void) {
     uint32_t sctlr_el1;
     __asm__ ("mrs %0, sctlr_el1" : "=r" (sctlr_el1) : :);
     LKMC_DUMP_SYSTEM_REGS_PRINTF("SCTLR_EL1 0x%" PRIX32 "\n", sctlr_el1);

path_properties.py

@@ -689,6 +689,8 @@ path_properties_tuples = (
                         'return2.c': {'exit_status': 2},
                         # This has complex failure modes, too hard to assert.
                         'smash_stack.c': {'skip_run_unclassified': True},
+                        'std_atomic.c': {'baremetal': False},
+                        'atomic': {'baremetal': False},
                         # Wrapper not defined by newlib.
                         'timespec_get.c': {'baremetal': False},
                     }