add missing skipifs

ext/bcmath/tests/bcdiv_error1.phpt

@@ -4,6 +4,8 @@ bcdiv — Divide two arbitrary precision numbers
 TestFest2009
 Antoni Torrents
 antoni@solucionsinternet.com
+--SKIPIF--
+<?php if(!extension_loaded("bcmath")) print "skip"; ?>
 --FILE--
 <?php
 echo bcdiv('10.99', '0');

ext/bcmath/tests/bcdiv_error2.phpt

@@ -3,6 +3,8 @@ bcdiv — Divide two arbitrary precision numbers
 --CREDITS--
 Antoni Torrents
 antoni@solucionsinternet.com
+--SKIPIF--
+<?php if(!extension_loaded("bcmath")) print "skip"; ?>
 --FILE--
 <?php
 echo bcdiv('1', '2', '3', '4');

ext/bcmath/tests/bcmod_error1.phpt

@@ -3,6 +3,8 @@ bcmod — Get modulus of an arbitrary precision number
 --CREDITS--
 Antoni Torrents
 antoni@solucionsinternet.com
+--SKIPIF--
+<?php if(!extension_loaded("bcmath")) print "skip"; ?>
 --FILE--
 <?php
 echo bcmod('1', '2', '3');

ext/bcmath/tests/bcpowmod_error1.phpt

@@ -3,6 +3,8 @@ bcpowmod — Raise an arbitrary precision number to another, reduced by a specif
 --CREDITS--
 Antoni Torrents
 antoni@solucionsinternet.com
+--SKIPIF--
+<?php if(!extension_loaded("bcmath")) print "skip"; ?>
 --FILE--
 <?php
 echo bcpowmod('1');

ext/bcmath/tests/bcpowmod_error2.phpt

@@ -3,6 +3,8 @@ bcpowmod — Raise an arbitrary precision number to another, reduced by a specif
 --CREDITS--
 Antoni Torrents
 antoni@solucionsinternet.com
+--SKIPIF--
+<?php if(!extension_loaded("bcmath")) print "skip"; ?>
 --FILE--
 <?php
 echo bcpowmod('1', '2');

ext/bcmath/tests/bcpowmod_error3.phpt

@@ -3,6 +3,8 @@ bcpowmod — Raise an arbitrary precision number to another, reduced by a specif
 --CREDITS--
 Antoni Torrents
 antoni@solucionsinternet.com
+--SKIPIF--
+<?php if(!extension_loaded("bcmath")) print "skip"; ?>
 --FILE--
 <?php
 echo bcpowmod('1', '2', '3', '4', '5');

ext/bcmath/tests/bcsqrt_error1.phpt

@@ -3,6 +3,8 @@ bcsqrt — Get the square root of an arbitrary precision number
 --CREDITS--
 Antoni Torrents
 antoni@solucionsinternet.com
+--SKIPIF--
+<?php if(!extension_loaded("bcmath")) print "skip"; ?>
 --FILE--
 <?php
 echo bcsqrt('-9');