Don't require glibc if it isn't linux.

This exempts alpine but doesn't affect, eg, FreeBSD.

Author: bitdancer

Python/ceval.c

@@ -442,8 +442,11 @@ _Py_InitializeRecursionLimits(PyThreadState *tstate)
     _tstate->c_stack_soft_limit = _tstate->c_stack_hard_limit + PYOS_STACK_MARGIN_BYTES;
 #else
     uintptr_t here_addr = _Py_get_machine_stack_pointer();
+/// XXX musl supports HAVE_PTHRED_GETATTR_NP, but the resulting stack size
+/// (on alpine at least) is much smaller than expected and imposes undue limits
+/// compared to the old stack size estimation.
 #  if defined(HAVE_PTHREAD_GETATTR_NP) && !defined(_AIX) && \
-        !defined(__NetBSD__) && defined(__GLIBC__)
+        !defined(__NetBSD__) && (defined(__GLIBC__) || !defined(__linux__))
     size_t stack_size, guard_size;
     void *stack_addr;
     pthread_attr_t attr;