test-container: Avoid copying unintended system libraries

Some DSOs are distributed in hardware capability directories, e.g.
/usr/lib64/power7/libc.so.6
Whenever the processor is able to use one of these hardware-enabled
DSOs, testroot.pristine ends up with copies of glibc-provided libraries
from the system because it can't overwrite or remove them.

This patch avoids the unintended copies by executing ld.so with the same
arguments passed to each glibc test.

	* Makefile (testroot.pristine/install.stamp): Execute ld.so with
	the same arguments used in all tests.

ChangeLog

@@ -1,3 +1,8 @@
+2019-07-23  Tulio Magno Quites Machado Filho  <[email protected]>
+
+	* Makefile (testroot.pristine/install.stamp): Execute ld.so with
+	the same arguments used in all tests.
+
 2019-07-22  Szabolcs Nagy  <[email protected]>
 
 	* NEWS: Mention the AArch64 IFUNC resolver ABI change.

Makefile

@@ -383,7 +383,7 @@ $(objpfx)testroot.pristine/install.stamp :
 ifeq ($(run-built-tests),yes)
 	# Copy these DSOs first so we can overwrite them with our own.
 	for dso in `$(test-wrapper-env) LD_TRACE_LOADED_OBJECTS=1  \
-		$(objpfx)elf/$(rtld-installed-name) \
+		$(rtld-prefix) \
 		$(objpfx)testroot.pristine/bin/sh \
 	        | grep / | sed 's/^[^/]*//' | sed 's/ .*//'` ;\
 	  do \
@@ -392,7 +392,7 @@ ifeq ($(run-built-tests),yes)
 	    $(test-wrapper) cp $$dso $(objpfx)testroot.pristine$$dso ;\
 	  done
 	for dso in `$(test-wrapper-env) LD_TRACE_LOADED_OBJECTS=1  \
-		$(objpfx)elf/$(rtld-installed-name) \
+		$(rtld-prefix) \
 		$(objpfx)support/$(LINKS_DSO_PROGRAM) \
 	        | grep / | sed 's/^[^/]*//' | sed 's/ .*//'` ;\
 	  do \