sys-libs/glibc: disable container tests, bug #712356

sandbox is not very compatible with filesystem unshare().
It can't check if mkdir(/proc) is a safe operation under
unshare/chroot. Let's disable container tests.

One day we can enable them if not running under sandbox.

Shoul deal with the following test failures:

    FAIL: elf/tst-dlopen-self-container
    FAIL: elf/tst-dlopen-tlsmodid-container
    FAIL: elf/tst-ifunc-fault-bindnow
    FAIL: elf/tst-ifunc-fault-lazy
    FAIL: elf/tst-ldconfig-bad-aux-cache
    FAIL: elf/tst-ldconfig-ld_so_conf-update
    FAIL: elf/tst-pldd

Reported-by: Toralf Förster
Bug: https://bugs.gentoo.org/712356
Package-Manager: Portage-2.3.94, Repoman-2.3.20
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>

sys-libs/glibc/glibc-2.31-r1.ebuild

@@ -1137,7 +1137,11 @@ src_compile() {
 
 glibc_src_test() {
 	cd "$(builddir nptl)"
-	emake check
+	# disable tests:
+	# - tests-container:
+	#     sandbox does not understand unshare() and prevents
+	#     writes to /proc/
+	emake check tests-container=
 }
 
 do_src_test() {

sys-libs/glibc/glibc-9999.ebuild

@@ -1136,7 +1136,11 @@ src_compile() {
 
 glibc_src_test() {
 	cd "$(builddir nptl)"
-	emake check
+	# disable tests:
+	# - tests-container:
+	#     sandbox does not understand unshare() and prevents
+	#     writes to /proc/
+	emake check tests-container=
 }
 
 do_src_test() {