These tests are known to fail, so disable them. It's not problem just on
Alpine, Julia also disabled libunwind tests in their Makefile.

--- a/Makefile.in
+++ b/Makefile.in
@@ -218,7 +218,7 @@
 ETAGS = etags
 CTAGS = ctags
 CSCOPE = cscope
-DIST_SUBDIRS = src tests doc
+DIST_SUBDIRS = src doc
 DISTFILES = $(DIST_COMMON) $(DIST_SOURCES) $(TEXINFOS) $(EXTRA_DIST)
 distdir = $(PACKAGE)-$(VERSION)
 top_distdir = $(distdir)