add macro CFIG_NO_FIX_STAT to disable fix_stat() for mkbootfs

just in case some geeks do not want the "fix stat" behavior
of Android cpio, a.k.a mkbootfs.

Test:
original attributes:
drw------- 2 yu yu 4.0K 2017-04-11 16:43 T1
drwxrwxrwx 2 yu yu 4.0K 2017-04-11 16:43 T2

generated boot image w/ fix_stat():
drwxr-xr-x   2 root   root        0 1969-12-31 18:00 T1
drwxr-xr-x   2 root   root        0 1969-12-31 18:00 T2

define CFIG_NO_FIX_STAT and disable fix_stat():
drw-------   2 root   root        0 1969-12-31 18:00 T1
drwxrwxrwx   2 root   root        0 1969-12-31 18:00 T2

build.gradle

@@ -23,6 +23,7 @@ model {
     components {
         mkbootfs(NativeExecutableSpec) {
             binaries.all {
+                // cCompiler.define 'CFIG_NO_FIX_STAT'
             }
         }
     }

src/mkbootfs/c/fs_config.c

@@ -33,6 +33,8 @@
 #include <sys/stat.h>
 #include <sys/types.h>
 
+#ifndef CFIG_NO_FIX_STAT
+
 #include <private/android_filesystem_config.h>
 #include <utils/Compat.h>
 
@@ -293,3 +295,4 @@ ssize_t fs_config_generate(char *buffer, size_t length, const struct fs_path_con
     strcpy(p->prefix, pc->prefix);
     return len;
 }
+#endif

src/mkbootfs/c/mkbootfs.c

@@ -12,7 +12,9 @@
 #include <stdarg.h>
 #include <fcntl.h>
 
+#ifndef CFIG_NO_FIX_STAT
 #include <private/android_filesystem_config.h>
+#endif
 
 /* NOTES
 **
@@ -54,6 +56,7 @@ static char *target_out_path = NULL;
 static int verbose = 0;
 static int total_size = 0;
 
+#ifndef CFIG_NO_FIX_STAT
 static void fix_stat(const char *path, struct stat *s)
 {
     uint64_t capabilities;
@@ -85,6 +88,7 @@ static void fix_stat(const char *path, struct stat *s)
         s->st_mode = (typeof(s->st_mode)) st_mode;
     }
 }
+#endif
 
 static void _eject(struct stat *s, char *out, int olen, char *data, unsigned datasize)
 {
@@ -98,7 +102,9 @@ static void _eject(struct stat *s, char *out, int olen, char *data, unsigned dat
         putchar(0);
     }
 
+#ifndef CFIG_NO_FIX_STAT
     fix_stat(out, s);
+#endif
 //    fprintf(stderr, "_eject %s: mode=0%o\n", out, s->st_mode);
 
     printf("%06x%08x%08x%08x%08x%08x%08x"