remove old files

externals/mbedtls/ChangeLog.d/drbg-mutex.txt

@@ -1,5 +0,0 @@
-Bugfix
-   * Fix a resource leak in CTR_DRBG and HMAC_DRBG when MBEDTLS_THREADING_C
-     is enabled, on platforms where initializing a mutex allocates resources.
-     This was a regression introduced in the previous release. Reported in
-     #4017, #4045 and #4071.

externals/mbedtls/ChangeLog.d/issue4093.txt

@@ -1,7 +0,0 @@
-Security
-   * Fix an errorneous estimation for an internal buffer in
-     mbedtls_pk_write_key_pem(). If MBEDTLS_MPI_MAX_SIZE is set to an odd
-     value the function might fail to write a private RSA keys of the largest
-     supported size.
-     Found by Daniel Otte, reported in #4093 and fixed in #4094,
-     backported in #4100.

externals/mbedtls/ChangeLog.d/mpi_sub_abs.txt

@@ -1,7 +0,0 @@
-Security
-   * Fix a buffer overflow in mbedtls_mpi_sub_abs() when calculating
-     |A| - |B| where |B| is larger than |A| and has more limbs (so the
-     function should return MBEDTLS_ERR_MPI_NEGATIVE_VALUE). Only
-     applications calling mbedtls_mpi_sub_abs() directly are affected:
-     all calls inside the library were safe since this function is
-     only called with |A| >= |B|. Reported by Guido Vranken in #4042.

externals/mbedtls/ChangeLog.d/net_poll-fd_setsize.txt

@@ -1,4 +0,0 @@
-Security
-   * Fix a stack buffer overflow with mbedtls_net_poll() and
-     mbedtls_net_recv_timeout() when given a file descriptor that is
-     beyond FD_SETSIZE. Reported by FigBug in #4169.

externals/mbedtls/ChangeLog.d/rsa-mutex.txt

@@ -1,13 +0,0 @@
-Bugfix
-   * Ensure that calling mbedtls_rsa_free() or mbedtls_entropy_free()
-     twice is safe. This happens for RSA when some Mbed TLS library functions
-     fail. Such a double-free was not safe when MBEDTLS_THREADING_C was
-     enabled on platforms where freeing a mutex twice is not safe.
-   * Fix a resource leak in a bad-arguments case of mbedtls_rsa_gen_key()
-     when MBEDTLS_THREADING_C is enabled on platforms where initializing
-     a mutex allocates resources.
-
-Default behavior changes
-   * In mbedtls_rsa_context objects, the ver field was formerly documented
-     as always 0. It is now reserved for internal purposes and may take
-     different values.

externals/mbedtls/ChangeLog.d/rsa_private-ret.txt

@@ -1,2 +0,0 @@
-Bugfix
-   * Fix an incorrect error code if an RSA private operation glitched.