as OpenSSL code said, -latomic is required for newer NDK (Ref: https://github.com/openssl/openssl/blob/master/Configurations/15-android.conf#L194)

tito · tito · commit ac30f878b2be · 2019-01-03T09:45:46.000+01:00
diff --git a/pythonforandroid/recipes/openssl/__init__.py b/pythonforandroid/recipes/openssl/__init__.py
@@ -110,7 +110,7 @@ def build_arch(self, arch):
             #              ^
             # crypto/aes/bsaes-armv7.S:1434:14: error: immediate operand must be in the range [0,4095]
             #  sub r6, r8, #.LREVM0SR-.LSR @ pass constants
-            shprint(perl, 'Configure', 'shared', 'no-dso', 'no-asm', buildarch,
+            shprint(perl, 'Configure', 'shared', 'no-dso', 'no-asm', '-latomic', buildarch,
                     '-D__ANDROID_API__={}'.format(self.ctx.ndk_api),
                     _env=env)
             self.apply_patch('disable-sover.patch', arch.arch)
