package/libcurl: fix build with wolfssl

Select BR2_PACKAGE_WOLFSSL_ALL as suggested by upstream in
https://github.com/curl/curl/issues/7745 to fix the following build
failure raised since bump to version 7.79.1 in commit
6d684213:

/home/giuliobenetti/autobuild/run/instance-3/output-1/host/lib/gcc/riscv64-buildroot-linux-uclibc/10.3.0/../../../../riscv64-buildroot-linux-uclibc/bin/ld: ../lib/.libs/libcurl.so: undefined reference to `wolfSSL_ERR_clear_error'

Fixes:
 - http://autobuild.buildroot.org/results/2956c8fb91a16d2ab59fb1c7babec46a6c8399e5



Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>