Remove libexecinfo on Alpine

Fix GH-1824.

The quick summary is Alpine 3.17 removed this library, and on older
versions it's apparently not great quality anyway.

.circleci/config.yml

@@ -1532,6 +1532,10 @@ jobs:
       - run:
           name: Build extension
           command: |
+            # Backtraces on Alpine are apparently sketchy, and removed in Alpine 3.17:
+            # https://gitlab.alpinelinux.org/alpine/aports/-/merge_requests/36722
+            # Ensure libexecinfo is _not_ installed, so support isn't detected
+            apk remove libexecinfo
             build-dd-trace-php
             mv extensions extensions_$(uname -m)
       - persist_to_workspace:

datadog-setup.php

@@ -66,7 +66,6 @@ function install($options)
     // Checking required libraries
     check_library_prerequisite_or_exit('libcurl');
     if (is_alpine()) {
-        check_library_prerequisite_or_exit('libexecinfo');
         if (is_truthy($options[OPT_ENABLE_PROFILING])) {
             check_library_prerequisite_or_exit('libgcc_s');
         }