PR ld/21529: Use a linker script to limit output with the test case

Complement commit d9409498813c ("Add a testcase for PR ld/21529") and
use a linker script to prevent an inter-segment gap arranged by the
default linker script associated with some targets such as `rx-elf':

$ ld -e main -o tmpdir/dump-elf tmpdir/pr21529.o
$ readelf -l tmpdir/dump-elf
Elf file type is EXEC (Executable file)
Entry point 0x10000004
There are 2 program headers, starting at offset 52

Program Headers:
  Type           Offset   VirtAddr   PhysAddr   FileSiz MemSiz  Flg Align
  LOAD           0x001000 0x10000000 0x10000000 0x00008 0x00008 R E 0x1000
  LOAD           0x001ffc 0xbffffffc 0xbffffffc 0x00004 0x00004 RW  0x1000

 Section to Segment mapping:
  Segment Sections...
   00     .text
   01     .stack
$

and converted to padding with the use of the binary BFD for output from
producing unreasonably large files.

	ld/
	* testsuite/ld-unique/pr21529.ld: New test linker script.
	* testsuite/ld-unique/pr21529.d: Use it.

ld/ChangeLog

@@ -1,3 +1,8 @@
+2016-07-14  Maciej W. Rozycki  <macro@imgtec.com>
+
+	* testsuite/ld-unique/pr21529.ld: New test linker script.
+	* testsuite/ld-unique/pr21529.d: Use it.
+
 2017-07-12  Alan Modra  <amodra@gmail.com>
 
 	* po/bg.po: Update from translationproject.org/latest/ld/.

ld/testsuite/ld-unique/pr21529.d

@@ -1,4 +1,4 @@
-#ld: --oformat binary -e main
+#ld: --oformat binary -T pr21529.ld -e main
 #objdump: -s -b binary
 #xfail: aarch64*-*-* arm*-*-* hppa-*-* ia64-*-* nds32*-*-* score-*-*
 

ld/testsuite/ld-unique/pr21529.ld

@@ -0,0 +1,5 @@
+SECTIONS
+{
+  .text : { *(.text) }
+  /DISCARD/ : { *(*) }
+}