Unable to use LLVM `15.0.6` in sdk `v0.29` and `15.0.7` in sdk `v0.30`

[jpmcb]

Image I'm using:

In v0.29 of the sdk, which uses LLVM 15.0.6 and in v0.30 of the sdk which uses LLVM 15.0.7, users found missing symbols:

readelf -a /*-bottlerocket-linux-musl/sys-root/usr/lib/libunwind.a | grep unw_getcontext

# 0.28.0 output
000000000720  00280000011b R_AARCH64_CALL26  0000000000000000 __unw_getcontext + 0
000000000a5c  00280000011b R_AARCH64_CALL26  0000000000000000 __unw_getcontext + 0
000000000b28  00280000011b R_AARCH64_CALL26  0000000000000000 __unw_getcontext + 0
    40: 0000000000000000     0 NOTYPE  GLOBAL DEFAULT  UND __unw_getcontext
0000000001c4  00240000011b R_AARCH64_CALL26  0000000000000000 __unw_getcontext + 0
000000000294  00240000011b R_AARCH64_CALL26  0000000000000000 __unw_getcontext + 0
00000000045c  00240000011b R_AARCH64_CALL26  0000000000000000 __unw_getcontext + 0
    36: 0000000000000000     0 NOTYPE  GLOBAL DEFAULT  UND __unw_getcontext
     6: 0000000000000000     0 FUNC    GLOBAL HIDDEN     1 __unw_getcontext
     7: 0000000000000000     0 FUNC    WEAK   DEFAULT    1 unw_getcontext

# 0.29.0 output
000000000720  00290000011b R_AARCH64_CALL26  0000000000000000 __unw_getcontext + 0
000000000a4c  00290000011b R_AARCH64_CALL26  0000000000000000 __unw_getcontext + 0
000000000b18  00290000011b R_AARCH64_CALL26  0000000000000000 __unw_getcontext + 0
    41: 0000000000000000     0 NOTYPE  GLOBAL DEFAULT  UND __unw_getcontext
0000000001c4  00250000011b R_AARCH64_CALL26  0000000000000000 __unw_getcontext + 0
000000000294  00250000011b R_AARCH64_CALL26  0000000000000000 __unw_getcontext + 0
00000000045c  00250000011b R_AARCH64_CALL26  0000000000000000 __unw_getcontext + 0
    37: 0000000000000000     0 NOTYPE  GLOBAL DEFAULT  UND __unw_getcontext

Notice the final two lines are missing in the v0.29 version of the sdk

GLOBAL HIDDEN     1 __unw_getcontext
     7: 0000000000000000     0 FUNC    WEAK   DEFAULT    1 unw_getcontext

(Shout out to @bcressey for getting this figured out!)

Related to #100

Issue or Feature Request:

Investigate what's going on with the newer versions of LLVM and why we are having trouble using them.