package/apr: Fix detection of rlimit and large file support

Snippets from configure log:

before:
checking whether to enable -D_LARGEFILE64_SOURCE... no
...
checking struct rlimit... no

after
checking whether to enable -D_LARGEFILE64_SOURCE... (cached) yes
...
checking struct rlimit... (cached) yes

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>