sim: Add dlsym to nuttx-names.in
Fixes the following crash with CONFIG_SIM_SANITIZE=y on Linux.
```
Program received signal SIGSEGV, Segmentation fault.
getpid () at task/task_getpid.c:76
76 task/task_getpid.c: No such file or directory.
rax 0x2feeb4 3141300
rbx 0xc53f83 12926851
rcx 0x6837665ee4c00 1833394399759360
rdx 0x472080 4661376
rsi 0xc53f83 12926851
rdi 0xffffffffffffffff -1
rbp 0x7ffe4cdfe140 0x7ffe4cdfe140
rsp 0x7ffe4cdfe0f0 0x7ffe4cdfe0f0
r8 0xffffffffffffffff -1
r9 0x0 0
r10 0x22 34
r11 0x246 582
r12 0x472080 4661376
r13 0x7ffe4cdfe3e8 140730188162024
r14 0x472080 4661376
r15 0xf60398 16122776
rip 0x4e9b93 0x4e9b93 <getpid+35>
eflags 0x10206 [ PF IF RF ]
cs 0x33 51
ss 0x2b 43
ds 0x0 0
es 0x0 0
fs 0x0 0
gs 0x0 0
#0 getpid () at task/task_getpid.c:76
#1 0x00000000006ad25a in modlib_registry_lock () at modlib/modlib_registry.c:89
#2 0x0000000000c3648d in modsym (handle=0xffffffffffffffff, name=0xc53f83 "mmap") at module/mod_modsym.c:77
#3 0x0000000000c2cd3a in dlsym (handle=0xffffffffffffffff, name=0xc53f83 "mmap") at dlfcn/lib_dlsym.c:149
#4 0x00000000004a0034 in __interception::InterceptFunction(char const*, unsigned long*, unsigned long, unsigned long) ()
#5 0x000000000048181e in InitializeCommonInterceptors() ()
#6 0x000000000048106a in __asan::InitializeAsanInterceptors() ()
#7 0x000000000049b85e in __asan::AsanInitInternal() ()
#8 0x00007f09cfb04ce6 in ?? () from /lib64/ld-linux-x86-64.so.2
#9 0x00007f09cfaf413a in ?? () from /lib64/ld-linux-x86-64.so.2
#10 0x0000000000000001 in ?? ()
#11 0x00007ffe4cdfff56 in ?? ()
#12 0x0000000000000000 in ?? ()
```
7f8d0c327b