php-mysql-4.0.3p11-1 carries a file dependency of libmysqlclient.so.9
This is found during the RPM build time by the library dependency checking
script.

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The mysql rebuild for 3.23.29-1 bumps /usr/lib/mysql/libmysqlclient to
libmysqlclient.so.10 -- As a result, it would break php-mysql to install
it.

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Solution:

Rebuild php, to emit a new php-mysql, and prospectively leave a reminder
in  the .SPEC file, or through some other mechanism, to remind future
rebuilders of this effect.

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JBJ included as a CC -- How might RPM detect this remote file dependency
effect, and interlock the rebuild of mysql without also carrying a php
rebuild?