libfixposix: fix include error on *BSD

[nueidris]

The default include path for cc doesn't include /usr/local (where non-base packages/libraries are usually installed on BSDs). The patch uses pkgconf to find libfixposix location, so iolib does not fail to build.

[sionescu]

Please run this command in the build directory of libfixposix and paste here the output: # grep -E '^LFS_' config.log

[nueidris]

root@pkg:/wrkdirs/usr/ports/devel/libfixposix/work/libfixposix-0.4.3 # grep -E '^LFS_' config.log
LFS_CFLAGS=''
LFS_LDFLAGS=''
LFS_LIBS=''

[nueidris]

Thank you for your fast response!

[sionescu]

Disponha.