Android: Don't call NativeLibrary methods during class init

There's no guarantee that directory initialization has completed by this
point, so we can't safely use NativeLibrary.

I'm making this change because of a crash being reported in Google Play
Console. The exact way it's crashing is mysterious to me, so I'm not
sure if this commit fixes the crash, but I think this commit is
a reasonable change to make even if it doesn't fix the crash. Backtrace
from Google Play Console:

  #00  pc 0x0000000000469074  /data/app/~~m0kqybFNfeqnDenQFc53XQ==/org.dolphinemu.dolphinemu-Mtaw0lU8DVUQbte2ZjBp3w==/lib/arm64/libmain.so (std::__ndk1::pair<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char>> const, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char>>>::pair[abi:nn180000]<char const* const&, char const* const&, 0>(char const* const&, char const* const&)) (BuildId: 64cfebf5b574b6729ebc51799aa94ccc3238cbcc)
  #01  pc 0x0000000000468e9c  /data/app/~~m0kqybFNfeqnDenQFc53XQ==/org.dolphinemu.dolphinemu-Mtaw0lU8DVUQbte2ZjBp3w==/lib/arm64/libmain.so (std::__ndk1::pair<std::__ndk1::__tree_iterator<std::__ndk1::__value_type<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char>>, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char>>>, std::__ndk1::__tree_node<std::__ndk1::__value_type<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char>>, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char>>>, void*>*, long>, bool> std::__ndk1::__tree<std::__ndk1::__value_type<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char>>, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char>>>, std::__ndk1::__map_value_compare<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char>>, std::__ndk1::__value_type<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char>>, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char>>>, std::__ndk1::less<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char>>>, true>, std::__ndk1::allocator<std::__ndk1::__value_type<std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char>>, std::__ndk1::basic_string<char, std::__ndk1::char_traits<char>, std::__ndk1::allocator<char>>>>>::__emplace_unique_impl<char const* const&, char const* const&>(char const* const&, char const* const&)) (BuildId: 64cfebf5b574b6729ebc51799aa94ccc3238cbcc)
  #02  pc 0x0000000000462f08  /data/app/~~m0kqybFNfeqnDenQFc53XQ==/org.dolphinemu.dolphinemu-Mtaw0lU8DVUQbte2ZjBp3w==/lib/arm64/libmain.so (Common::Log::LogManager::GetLogTypes()) (BuildId: 64cfebf5b574b6729ebc51799aa94ccc3238cbcc)
  #03  pc 0x000000000044339c  /data/app/~~m0kqybFNfeqnDenQFc53XQ==/org.dolphinemu.dolphinemu-Mtaw0lU8DVUQbte2ZjBp3w==/lib/arm64/libmain.so (Java_org_dolphinemu_dolphinemu_NativeLibrary_GetLogTypeNames+56) (BuildId: 64cfebf5b574b6729ebc51799aa94ccc3238cbcc)
  #04  pc 0x000000000031456c  /data/misc/apexdata/com.android.art/dalvik-cache/arm64/boot.oat (art_jni_trampoline+108)
  #05  pc 0x0000000000781508  /apex/com.android.art/lib64/libart.so (nterp_helper+152)
  #06  pc 0x00000000002d94d4  /data/app/~~m0kqybFNfeqnDenQFc53XQ==/org.dolphinemu.dolphinemu-Mtaw0lU8DVUQbte2ZjBp3w==/base.apk (org.dolphinemu.dolphinemu.features.settings.ui.SettingsFragmentPresenter.<clinit>+16)
[...]

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