[RFC PATCH] configure: don't try a "native" cross for i386

["Alex Bennée" <alex.bennee@linaro.org>]

As 32 bit x86 become rarer we are starting to run into problems with
search paths. Although we switched to a Debian container we still
favour the native CC on a Bookworm host. As a result we have a broken
cross compile setup which then fails to build with:

    BUILD   i386-linux-user guest-tests
  In file included from /usr/include/linux/stat.h:5,
                   from /usr/include/bits/statx.h:31,
                   from /usr/include/sys/stat.h:465,
                   from /home/alex/lsrc/qemu.git/tests/tcg/multiarch/linux/linux-test.c:28:
  /usr/include/linux/types.h:5:10: fatal error: asm/types.h: No such file or directory
      5 | #include <asm/types.h>
        |          ^~~~~~~~~~~~~
  compilation terminated.
  make[1]: *** [Makefile:119: linux-test] Error 1
  make: *** [/home/alex/lsrc/qemu.git/tests/Makefile.include:50: build-tcg-tests-i386-linux-user] Error 2

So lets stop trying to be cute and honour cross_prefix_i386 when
searching locally. We also need to ensure we are using the correct
prefix if we do end up using the container version. We can also drop
the extra CFLAGS while we are at it.

Fixes: 791e6fedc5 (tests/docker: replace fedora-i386 with debian-i686)
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
---
 configure | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/configure b/configure
index 5e7b76e3a1..2343d629ec 100755
--- a/configure
+++ b/configure
@@ -1190,7 +1190,6 @@ fi
 : ${cross_cc_cflags_armeb="-mbig-endian"}
 : ${cross_cc_hexagon="hexagon-unknown-linux-musl-clang"}
 : ${cross_cc_cflags_hexagon="-mv73 -O2 -static"}
-: ${cross_cc_cflags_i386="-m32"}
 : ${cross_cc_cflags_ppc="-m32 -mbig-endian"}
 : ${cross_cc_cflags_ppc64="-m64 -mbig-endian"}
 : ${cross_cc_ppc64le="$cross_cc_ppc64"}
@@ -1308,7 +1307,7 @@ probe_target_compiler() {
         ;;
       i386)
         container_image=debian-i686-cross
-        container_cross_prefix=
+        container_cross_prefix=i686-linux-gnu-
         ;;
       loongarch64)
         container_image=debian-loongarch-cross
@@ -1394,7 +1393,6 @@ probe_target_compiler() {
   case "$target_arch:$cpu" in
     aarch64_be:aarch64 | \
     armeb:arm | \
-    i386:x86_64 | \
     mips*:mips64 | \
     ppc*:ppc64 | \
     sparc:sparc64 | \
-- 
2.39.2