Replace invalid code with a proper #error

This code creates a nasty error as mentioned in bugs #31131, #37062
Patch taken from Debian's PHP package: 044-strtod_arm_fix
Merge branch 'PHP-5.4' into PHP-5.5

* PHP-5.4:
  Replace invalid code with a proper #error
Merge branch 'PHP-5.5' into PHP-5.6

* PHP-5.5:
  Replace invalid code with a proper #error