Update net-snmp to 5.4.1.2 and enable it.

https://www.illumos.org/issues/4190
https://www.illumos.org/issues/2245
PHP 5.4.21: first part
Merge pull request #292 from pyhalov/php

PHP 5.4.21: first part
PHP 5.4.21: second part (modules)
Fix php-xdebug warning
Merge pull request #293 from pyhalov/php

PHP 5.4.21: modules
Fix libperl

https://www.illumos.org/issues/4190
Merge pull request #294 from pyhalov/perl

Fix libperl
Merge pull request #295 from pyhalov/net-snmp

Update net-snmp to 5.4.1.2 and enable it.
illumos-gate: Fix sh error when .downloaded doesn't exist on gmake update without previous gmake download.
Merge pull request #296 from pyhalov/illumos-gate

illumos-gate: Fix sh error when .downloaded doesn't exist on gmake updat...
Obsolete cxa_finalize (it is not used by anything, necessary functions are in libc)
Merge pull request #297 from pyhalov/cxa_finalize

Obsolete cxa_finalize
Fix Firefox crash in sqlite3_randomness

https://www.illumos.org/issues/4254
Merge pull request #298 from pyhalov/sqlite3

Fix Firefox crash in sqlite3_randomness