-Wl, --enable-new-dtags for DT_RUNPATH instead of DT_RPATH

Today by accident i had to deal with linker problems of some
software and found an issue that mentioned DT_RUNPATH, which
mentioned that DT_RPATH is legacy and searched for
$LD_LIBRARY_PATH, whereas the newer DT_RUNPATH is searched
thereafter.  Completely unencrypted!  Well.  For what's it worth,
i for one am astonished because of course i want to override
$LD_LIBRARY_PATH, but it surely has its merites, smart people came
to the conclusion, did they.

The attached diff below seems to be sufficient to support
DT_RUNPATH instead of DT_RPATH with tcc(1).  But i have no insight
in what --enable-new-dtags is supposed to change in addition, so
i wonder.

Ciao!

--steffen

 libtcc.c     | 2 ++
 tcc-doc.texi | 4 ++++
 tcc.h        | 1 +
 tccelf.c     | 3 ++-
 4 files changed, 9 insertions(+), 1 deletion(-)

tcc.h

@@ -605,6 +605,7 @@ struct TCCState {
     char *tcc_lib_path; /* CONFIG_TCCDIR or -B option */
     char *soname; /* as specified on the command line (-soname) */
     char *rpath; /* as specified on the command line (-Wl,-rpath=) */
+    int enable_new_dtags; /* ditto, (-Wl,--enable-new-dtags) */
 
     /* output type, see TCC_OUTPUT_XXX */
     int output_type;