open.test, openat.test: lift /proc requirement

While -P option needs /proc to match descriptors, it does not use
/proc to match pathnames.  As these tests do not need descriptor
match, the /proc requirement can be safely lifted.

* tests/open.test: Lift /proc/self/fd/ requirement.
* tests/openat.test: Likewise.

tests/open.test

@@ -4,10 +4,6 @@
 
 . "${srcdir=.}/init.sh"
 
-# strace -P is implemented using /proc/self/fd
-[ -d /proc/self/fd/ ] ||
-	framework_skip_ '/proc/self/fd/ is not available'
-
 run_prog > /dev/null
 OUT="$LOG.out"
 syscall=${ME_%.test}

tests/openat.test

@@ -4,10 +4,6 @@
 
 . "${srcdir=.}/init.sh"
 
-# strace -P is implemented using /proc/self/fd
-[ -d /proc/self/fd/ ] ||
-	framework_skip_ '/proc/self/fd/ is not available'
-
 run_prog > /dev/null
 OUT="$LOG.out"
 syscall=${ME_%.test}