bdwgc-native: Add missing pkgconfig DEPENDS
This fixes configure errors like:
| configure.ac:70: error: possibly undefined macro: AC_MSG_ERROR
| If this token and others are legitimate, please use m4_pattern_allow.
| See the Autoconf documentation.
| configure.ac:358: error: possibly undefined macro: AS_IF
Reproduced with bitbake bdwgc-native pkgconfig-native -c clean; bitbake bdwgc-native
(From OE-Core master rev:
defa05f2085f78d9ec9ada7051c284e1fc72e6c1)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
