otherwise if profile_str_len is > strlen(gSrtpProfiles[i].name) we end up
comparing memory past gSrtpProfiles[i].name. -fsanitize=address catches this:
```
==100159==ERROR: AddressSanitizer: global-buffer-overflow on address 0x7f40d8d533b2 at pc 0x7f40d8eb014f bp 0x7f40d50fe240 sp 0x7f40d50fd9e8
READ of size 21 at 0x7f40d8d533b2 thread T107
#0 0x7f40d8eb014e in MemcmpInterceptorCommon(void*, int (*)(void const*, void const*, unsigned long), void const*, void const*, unsigned long) /build/gcc/src/gcc/libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:860
#1 0x7f40d8eb06e6 in __interceptor_memcmp /build/gcc/src/gcc/libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:892
#2 0x7f40d8eb06e6 in __interceptor_memcmp /build/gcc/src/gcc/libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:887
#3 0x7f40d8c2e830 in DtlsSrtpFindProfile src/ssl.c:1310
#4 0x7f40d8c2e9ed in DtlsSrtpSelProfiles src/ssl.c:1347
#5 0x7f40d8c2eada in wolfSSL_CTX_set_tlsext_use_srtp src/ssl.c:1359
#6 0x563bf381b4c5 in server_test examples/server/server.c:2278
#7 0x7f40d88f0258 in start_thread (/usr/lib/libpthread.so.0+0x9258)
#8 0x7f40d88195e2 in __GI___clone (/usr/lib/libc.so.6+0xfe5e2)
```
This commit adds `wolfSSL_SetTimeCb` and `wolfSSL_time`. The former allows the
user to override the function wolfSSL uses to get the current time,
`wolfSSL_time`. If set, `wolfSSL_time` uses that function. If not set,
`wolfSSL_time` uses the `XTIME` macro by default. This functionality is needed
for the port of chrony to wolfSSL. chrony is an NTP implementation that uses
GnuTLS by default. For TLS, chrony uses the time it computes in place of the
default system time function.
Fixed a lot of shadowed global values. Some were prototype and function
declaration parameter name conflicts. Some conflicted with typenames.
Some conflicted with globals in libc.
By default this change will have servers send the renegotiation info
extension, but not allow renegotiation. This is accordance with RFC 5746
From to RFC 5746:
> In order to enable clients to probe, even servers that do not support
> renegotiation MUST implement the minimal version of the extension
> described in this document for initial handshakes, thus signaling
> that they have been upgraded.
With openSSL 3.0 the default it not allow connections to servers
without secure renegotiation extension. See
https://github.com/openssl/openssl/pull/15127
* Flow control failed on wrap around when there is going to be no more
flow control packets.
* If ISOTP_Send is provided more than 4095 bytes, limit it to 4095 bytes
as wolfSSL will retry with the rest.
* Set the default receive size to the max ISO-TP data size.
* A few other cleanups.
