readelf: Add -j/--display-section command line option.

binutils/testsuite/binutils-all/display-section.0

diff --git a/binutils/testsuite/binutils-all/display-section.0 b/binutils/testsuite/binutils-all/display-section.0
new file mode 100644
index 0000000..80d9744
--- /dev/null
+++ b/binutils/testsuite/binutils-all/display-section.0
@@ -0,0 +1 @@
+.*: Info: Unable to display section 0 - it has a NULL type

binutils/testsuite/binutils-all/display-section.r

diff --git a/binutils/testsuite/binutils-all/display-section.r b/binutils/testsuite/binutils-all/display-section.r
new file mode 100644
index 0000000..2d22bdc
--- /dev/null
+++ b/binutils/testsuite/binutils-all/display-section.r
@@ -0,0 +1,4 @@
+.*: Warning: Section '.*' was not dumped because it does not exist
+
+Relocation section '.*' at offset 0x.* contains .* entries:
+#...