Remove references to bundled mbedtls library to use the one from inputs.

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1e27d21..f0eb1a5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -85,13 +85,6 @@ endif()
 
 set(USE_STATIC_MBEDTLS_LIBRARY ON)
 set(USE_SHARED_MBEDTLS_LIBRARY OFF)
-add_subdirectory("lib/mbedtls" EXCLUDE_FROM_ALL)
-
-# Compile the mbedtls library as a static with position independent code,
-# because we need it for both a shared and static library
-set_property(TARGET mbedtls PROPERTY POSITION_INDEPENDENT_CODE ON)
-set_property(TARGET mbedcrypto PROPERTY POSITION_INDEPENDENT_CODE ON)
-set_property(TARGET mbedx509 PROPERTY POSITION_INDEPENDENT_CODE ON)
 
 add_subdirectory(src)
 
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<tr><td><span title='2022-06-05 20:27:37 -0700'>2022-06-05</span></td><td><a href='/guix/commit/gnu/packages/patches/ncftp-reproducible.patch?id=ce6d8ca4430e7df27c77e116a677679f241551da'>gnu: ncftp: Build reproducibly.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/patches/ncftp-reproducible.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add patch.
* gnu/packages/ftp.scm (ncftp): Add patch.
</span></span></td><td>Vagrant Cascadian</td></tr>