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='2019-07-02 16:45:17 +0200'>2019-07-02</span></td><td><a href='/guix/commit/gnu/packages/patches/glibc-CVE-2019-9169.patch?id=5f3f70391809f8791c55c05bd1646bc58508fa2c'>gnu: glibc: Update to 2.29.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/patches/glibc-bootstrap-system.patch,
gnu/packages/patches/glibc-supported-locales.patch: Adjust for glibc 2.29.
* gnu/packages/patches/glibc-2.28-supported-locales.patch,
gnu/packages/patches/glibc-CVE-2019-7309.patch,
gnu/packages/patches/glibc-CVE-2019-9169.patch,
gnu/packages/patches/glibc-2.29-git-updates.patch: New files.
* gnu/local.mk (dist_patch_DATA): Adjust accordingly.
* gnu/packages/base.scm (glibc): Update to 2.29.
[source](patches): Add 'glibc-CVE-2019-7309.patch',
'glibc-CVE-2019-9169.patch', and 'glibc-2.29-git-updates.patch'.  Remove
'glibc-hurd-magic-pid.patch'.
[native-inputs]: Add PYTHON-MINIMAL.
(glibc-2.28): New public variable.
* gnu/packages/commencement.scm (expat-sans-tests, python-boot0): New variables.
(glibc-final-with-bootstrap-bash)[native-inputs]: Add PYTHON-BOOT0.
* gnu/packages/python.scm (python-3.7)[arguments]: Disable test that fails
with glibc 2.29.
</span></span></td><td>Marius Bakke</td></tr>