Fixes #3943: Move r29774 to v1.7 branch (fix ob1 undefined sendreq value)

---svn-pre-commit-ignore-below---

r29774 [[BR]]
Fix another clang warning: sendreq is undefined if proc==NULL.

cmr=v1.7.4:reviewer=hjelmn:subject=fix ob1 undefined sendreq value
Fixes #3944: Move r29776 to v1.7 branch (Update autogen.pl with the minimum)

---svn-pre-commit-ignore-below---

r29776 [[BR]]
Update autogen.pl with the minimum automake version (1.12.2).

cmr=v1.7.4:reviewer=rhc
Silence compiler warning when --disable-orte-static-ports