mes libc has no time support, so we remove that.

It also does not have fch{own,mod}, which we don't care about in the bootstrap
anyway, so we can null-op those calls.

diff -r -N -U3 bzip2.c bzip2.c
--- bzip2.c	2019-07-13 18:50:05.000000000 +0100
+++ bzip2.c	2021-01-14 14:11:40.160213521 +0000
@@ -1051,12 +1051,9 @@
 {
 #  if BZ_UNIX
    IntNative      retVal;
-   struct utimbuf uTimBuf;
 
-   uTimBuf.actime = fileMetaInfo.st_atime;
-   uTimBuf.modtime = fileMetaInfo.st_mtime;
 
-   retVal = utime ( dstName, &uTimBuf );
+   retVal = 0;
    ERROR_IF_NOT_ZERO ( retVal );
 #  endif
 }
diff -r -N -U3 utime.h utime.h
--- utime.h	1970-01-01 01:00:00.000000000 +0100
+++ utime.h	2021-01-14 18:11:11.253825037 +0000
@@ -0,0 +1,2 @@
+#define fchown(filedes, owner, group) 0
+#define fchmod(filedes, mode) 0