https://bugs.gentoo.org/925241

Replace -I with -iquote to avoid overriding stack system header from libcxx-18
with the previously built stack binary. Override DEFAULT_INLCUDES because m4
adds -I. by default.

--- a/config/eu.am
+++ b/config/eu.am
@@ -31,7 +31,7 @@
 ##
 
 DEFS = -D_GNU_SOURCE -DHAVE_CONFIG_H -DLOCALEDIR='"${localedir}"'
-AM_CPPFLAGS = -I. -I$(srcdir) -I$(top_srcdir)/lib -I..
+AM_CPPFLAGS = -iquote . -I$(srcdir) -I$(top_srcdir)/lib -I..
 
 # Drop the 'u' flag that automake adds by default. It is incompatible
 # with deterministic archives.
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -19,6 +19,8 @@
 include $(top_srcdir)/config/eu.am
 DEFS += $(YYDEBUG) -DDEBUGPRED=@DEBUGPRED@ \
 	-DSRCDIR=\"$(shell cd $(srcdir);pwd)\" -DOBJDIR=\"$(shell pwd)\"
+
+DEFAULT_INCLUDES =
 AM_CPPFLAGS += -I$(srcdir)/../libelf -I$(srcdir)/../libebl \
 	    -I$(srcdir)/../libdw -I$(srcdir)/../libdwelf \
 	    -I$(srcdir)/../libdwfl -I$(srcdir)/../libasm -I../debuginfod