Revert "musllinux wheels use new libunwind"

This reverts commit b2b5679.

Author: pablogsal

pyproject.toml

@@ -170,14 +170,5 @@ before-all = [
   "apk add libintl",
 
   # Install Memray's other build and test dependencies
-  "apk add --update lz4-dev",
-
-  # Build libunwind from source
-  "cd /",
-  "LIBUNWIND_VERS=1.8.3",
-  "curl -LO https://github.com/libunwind/libunwind/releases/download/v$LIBUNWIND_VERS/libunwind-$LIBUNWIND_VERS.tar.gz",
-  "tar xf libunwind-$LIBUNWIND_VERS.tar.gz",
-  "cd libunwind-$LIBUNWIND_VERS",
-  "./configure --disable-minidebuginfo",
-  "make install",
+  "apk add --update libunwind-dev lz4-dev"
 ]