test-release.sh: Don't use chrpath on Solaris

[ro]

Summary

When trying to run test-release.sh on Solaris 11.4 for 9.0.0 rc4, I failed initially
because Solaris lacks chrpath. This patch accounts for that and allowed the run to
continue.

However, when its use was introduced back in 2013 r194999, it was justified by a libtool quirk
of emedding build directories in RPATHs. Given that libtool isn't used any longer, one
might instead want to revert that patch instead.

The current version was tested on amd64-pc-solaris2.11 and sparcv9-sun-solaris2.11.

[tstellar]

LGTM. I think CMake removes the build RPATH when installing, but we'd have to confirm that before removing this code.

llvm/trunk/utils/release/test-release.sh

 function check_program_exists() {
   local program="$1"
   if ! type -P $program > /dev/null 2>&1 ; then
     echo "program '$1' not found !"
     exit 1
   fi
 }
 
-if [ "$System" != "Darwin" ]; then
+if [ "$System" != "Darwin" -a "$System" != "SunOS" ]; then
   check_program_exists 'chrpath'
+fi
+
+if [ "$System" != "Darwin" ]; then
   check_program_exists 'file'
   check_program_exists 'objdump'
 fi
 
 check_program_exists ${MAKE}
 
 # Make sure that the URLs are valid.
 function check_valid_urls() {
if [ $do_test_suite = 'yes' ]; then
       fi
     fi
     cd $BuildDir
 }
 
 # Clean RPATH. Libtool adds the build directory to the search path, which is
 # not necessary --- and even harmful --- for the binary packages we release.
 function clean_RPATH() {
-  if [ "$System" = "Darwin" ]; then
+  if [ "$System" = "Darwin" -o "$System" = "SunOS" ]; then
     return
   fi
   local InstallPath="$1"
   for Candidate in `find $InstallPath/{bin,lib} -type f`; do
     if file $Candidate | grep ELF | egrep 'executable|shared object' > /dev/null 2>&1 ; then
       if rpath=`objdump -x $Candidate | grep 'RPATH'` ; then
         rpath=`echo $rpath | sed -e's/^ *RPATH *//'`
         if [ -n "$rpath" ]; then