Improve the check for departures from C89, and fix the departures

I found.
* Makefile.maint (my-distcheck): Also check for C89 compatibility
as best we can with GCC.
* src/stat.c (PRINTF_OPTION): Omit comma before } in enum
declaration; C89 doesn't allow this.
* src/dcgen: Don't generate string literals longer than
what C89 requires support for.
* src/cut.c (usage): Don't use string literals longer than
what C89 requires support for.
* src/date.c (usage): Likewise.
* src/dd.c (usage): Likewise.
* src/du.c (usage): Likewise.
* src/ls.c (usage): Likewise.
* src/od.c (usage): Likewise.
* src/readlink.c (usage): Likewise.
* src/seq.c (usage): Likewise.
* src/shred.c (usage): Likewise.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/du.c b/src/du.c
index 5f4e796db..6a4c8c7c8 100644
--- a/src/du.c
+++ b/src/du.c
@@ -293,6 +293,8 @@ Mandatory arguments to long options are mandatory for short options too.\n\
                           the apparent size is usually smaller, it may be\n\
                           larger due to holes in (`sparse') files, internal\n\
                           fragmentation, indirect blocks, and the like\n\
+"), stdout);
+      fputs (_("\
   -B, --block-size=SIZE use SIZE-byte blocks\n\
   -b, --bytes           equivalent to `--apparent-size --block-size=1'\n\
   -c, --total           produce a grand total\n\
@@ -305,6 +307,8 @@ Mandatory arguments to long options are mandatory for short options too.\n\
                           change to be equivalent to --dereference-args (-D)\n\
   -h, --human-readable  print sizes in human readable format (e.g., 1K 234M 2G)\n\
       --si              like -h, but use powers of 1000 not 1024\n\
+"), stdout);
+      fputs (_("\
   -k                    like --block-size=1K\n\
   -l, --count-links     count sizes many times if hard linked\n\
   -m                    like --block-size=1M\n\