pp.c: dont work around glibc 2.2.5 _moddi3 bugs past 2.7

Add glibc version checks to avoid runtime workarounds for an ancient bug.

p1- 224ec32361 in 2003 added a per-op one-time test to detect the bug,
    and patch around it in op_ppaddr.
p2- befad5d118 in 2007 limited the workaround to GLIBC and IVSIZE == 8
p3- a5bd31f4dc in 2012 suppressed it for defined(PERL_DEBUG_READONLY_OPS)

https://bugzilla.redhat.com/show_bug.cgi?id=65612
describes the test implemented in [p1]

Per wikipedia:
v2.2.5 isnt dated, but 2.2.4 is 7/2001.  redhat fixed theirs in 9/2002
v2.3 is 10/2002, and likely never had the bug released.
v2.3.2 in debian sarge, 2.3.4 in RHEL4

So picking v2.7 (10/2007) as last version pessimized is still quite
conservative, but also already 7 years old, 2x++ our perlpolicy support
window.  Its unlikely that such a platform would be seeing an install
of v5.22 or later.