Description of problem:
The PHP SRPM uses libtool to build the binary RPM, but doesn't include
it as a build dependency.  Thus, builds can be started without proper
prereqs in place.

Version-Release number of selected component (if applicable):
php-4.3.2-14.ent

How reproducible:
every time

Steps to Reproduce:
1. rpm -i /path/to/php-4.3.2-14.ent.src.rpm
2. su root -c "rpm -e libtool"
3. rpmbuild -ba /path/to/php.spec
  
Actual results:
libtool:  not found.

Expected results:
write:  /path/to/RPMS/php-4.3.2-14.ent.i386.rpm (etc)


Additional info:
trivial fix, but I figured it should be logged.