Cppcheck doesn't build with musl libc

[ams21]

I've noticed since version 2.19.0 building with musl libc (alpine for example). I get the following error:

/dev/cppcheck/cli/stacktrace.cpp:29:10: fatal error: execinfo.h: No such file or directory
   29 | #include <execinfo.h>
      |          ^~~~~~~~~~~~

But using the following patch it works:

diff --git a/lib/config.h b/lib/config.h
index a63cf773d..d29e630f6 100644
--- a/lib/config.h
+++ b/lib/config.h
@@ -206,7 +206,7 @@
 #define USE_WINDOWS_SEH
 #endif

-#if !defined(NO_UNIX_BACKTRACE_SUPPORT) && defined(__GNUC__) && !defined(__APPLE__) && !defined(__CYGWIN__) && !defined(__MINGW32__) && !defined(__NetBSD__) && !defined(__OpenBSD__) && !defined(__SVR4) && !defined(__QNX__) && !defined(_AIX)
+#if !defined(NO_UNIX_BACKTRACE_SUPPORT) && defined(__GNUC__) && defined(__GLIBC__) && !defined(__APPLE__) && !defined(__CYGWIN__) && !defined(__MINGW32__) && !defined(__NetBSD__) && !defined(__OpenBSD__) && !defined(__SVR4) && !defined(__QNX__) && !defined(_AIX)
 #define USE_UNIX_BACKTRACE_SUPPORT
 #endif

Not sure if this is the appropriate fix but reading this it mentions explicitly that execinfo.h is not available on the following platforms: musl libc, FreeBSD 9.3, NetBSD 6.1, OpenBSD 6.9, Minix 3.1.8, AIX 5.1, HP-UX 11, Solaris 10, Cygwin, mingw, MSVC 14, Android 9.0

[CHR]

If you want this merged, please open a PR at https://github.com/danmar/cppcheck/pulls