build: avoid -Wno-old-style-declaration with gcc 4.2
build: avoid -Wno-old-style-declaration with gcc 4.2

Fixes the build on FreeBSD <= 9 with the default compiler.

Fixes #4186.

dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node