configure, meson: move CPU_CFLAGS out of QEMU_CFLAGS

Flags that choose the target architecture, such as -m32 on x86, affect
all invocations of the compiler driver, for example including options
such as --print-search-dirs.  To ensure that they are treated as such,
place them in the cross file in the [binaries] section instead of
including them in QEMU_CFLAGS.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

configure

@@ -142,11 +142,11 @@ lines: ${BASH_LINENO[*]}"
 }
 
 do_cc() {
-    do_compiler "$cc" "$@"
+    do_compiler "$cc" $CPU_CFLAGS "$@"
 }
 
 do_cxx() {
-    do_compiler "$cxx" "$@"
+    do_compiler "$cxx" $CPU_CFLAGS "$@"
 }
 
 # Append $2 to the variable named $1, with space separation
@@ -1688,7 +1688,6 @@ esac
 
 eval "cross_cc_${cpu}=\$cc"
 cross_cc_vars="$cross_cc_vars cross_cc_${cpu}"
-QEMU_CFLAGS="$CPU_CFLAGS $QEMU_CFLAGS"
 
 # For user-mode emulation the host arch has to be one we explicitly
 # support, even if we're using TCI.
@@ -5114,9 +5113,9 @@ if test "$skip_meson" = no; then
   echo "c_link_args = [${LDFLAGS:+$(meson_quote $LDFLAGS)}]" >> $cross
   echo "cpp_link_args = [${LDFLAGS:+$(meson_quote $LDFLAGS)}]" >> $cross
   echo "[binaries]" >> $cross
-  echo "c = [$(meson_quote $cc)]" >> $cross
-  test -n "$cxx" && echo "cpp = [$(meson_quote $cxx)]" >> $cross
-  test -n "$objcc" && echo "objc = [$(meson_quote $objcc)]" >> $cross
+  echo "c = [$(meson_quote $cc $CPU_CFLAGS)]" >> $cross
+  test -n "$cxx" && echo "cpp = [$(meson_quote $cxx $CPU_CFLAGS)]" >> $cross
+  test -n "$objcc" && echo "objc = [$(meson_quote $objcc $CPU_CFLAGS)]" >> $cross
   echo "ar = [$(meson_quote $ar)]" >> $cross
   echo "nm = [$(meson_quote $nm)]" >> $cross
   echo "pkgconfig = [$(meson_quote $pkg_config_exe)]" >> $cross