Enable system CA certifications for OTP 26

Erlang's httpc now looks for CA certifications in the normal system
location even with `:verify_none`. It looks like the `:verify_none`
issue will be fixed in [PR
7303](erlang/otp#7303), but it seems useful to
have a good set of certs there for httpc users.

Author: fhunleth

nerves_defconfig

@@ -45,6 +45,7 @@ BR2_PACKAGE_LINUX_FIRMWARE_RALINK_RT2XX=y
 BR2_PACKAGE_LINUX_FIRMWARE_RTL_87XX=y
 BR2_PACKAGE_LINUX_FIRMWARE_TI_WL18XX=y
 # BR2_PACKAGE_RNG_TOOLS_JITTERENTROPY_LIBRARY is not set
+BR2_PACKAGE_CA_CERTIFICATES=y
 BR2_PACKAGE_LIBP11=y
 BR2_PACKAGE_UNIXODBC=y
 BR2_PACKAGE_LIBMNL=y