System.Security.Native.Cryptography.Native needs libssl.so and libcrypto.so, both of which are provided by Termux
This sets rpath to help the linker find them during runtime

--- a/src/runtime/src/native/libs/System.Security.Cryptography.Native/CMakeLists.txt
+++ b/src/runtime/src/native/libs/System.Security.Cryptography.Native/CMakeLists.txt
@@ -1,6 +1,7 @@
 project(System.Security.Cryptography.Native C)

 # These are happening inside of OpenSSL-defined macros out of our control
+add_link_options("-Wl,-rpath,@TERMUX_PREFIX@/lib")
 add_compile_options(-Wno-cast-align)
 add_compile_options(-Wno-reserved-id-macro)
 add_compile_options(-Wno-documentation)