Uses/php.mk: Helper variable to disable FLAVOR

- Currently our php.mk is defined in such a way that when testing with
  poudriere if a port do not support the PHP default version it tries to
  build with a different php version that the port supports.
  Unfortunately this behavior is not too much helpful when we want to
  add/remove a old/new php version as it doesn't gives a clear picture
  of which ports fails to build with a specific PHP version. So this
  patch defines a variable "BUILD_ONLY_DEFAULT_PHP_FLAVOR". If this
  variable is defined in make.conf then poudriere will build with default
  flavor and in case it's not supported this will IGNORE/SKIP the port which
  gives a clear overview of which ports are going to create problem
  while adding/removing/changing default php.

- One more thing is there are some old php modules still listed
  specifically dbase_DEPENDS, mssql_DEPENDS and sybase_ct_DEPENDS which
  are actually no longer in the tree.

PR:		262639
Approved by:	ale (maintainer-timeout)
Sponsored by:	Bounce Experts

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