configure: unify ppc64 and ppc64le

The only difference between the two, as far as either configure or
Meson are concerned, is the default endianness of the compiler.

For tests/tcg, specify the endianness explicitly on the command line;
for configure, do the same so that it is possible to have --cpu=ppc64le
on a bigendian system or vice versa.  Apart from this, cpu=ppc64le can
be normalized to ppc64 also in configure and not just in the meson
cross file.

Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

configure

@@ -661,9 +661,10 @@ case "$cpu" in
   ppc)
     CPU_CFLAGS="-m32" ;;
   ppc64)
-    CPU_CFLAGS="-m64" ;;
+    CPU_CFLAGS="-m64 -mbig" ;;
   ppc64le)
-    ARCH="ppc64" ;;
+    cpu="ppc64"
+    CPU_CFLAGS="-m64 -mlittle" ;;
 
   s390)
     CPU_CFLAGS="-m31"
@@ -3721,7 +3722,7 @@ if test "$linux" = "yes" ; then
   i386|x86_64|x32)
     linux_arch=x86
     ;;
-  ppc|ppc64|ppc64le)
+  ppc|ppc64)
     linux_arch=powerpc
     ;;
   s390x)
@@ -3903,9 +3904,6 @@ if test "$skip_meson" = no; then
         x86_64|x32)
             echo "cpu_family = 'x86_64'" >> $cross
             ;;
-        ppc64le)
-            echo "cpu_family = 'ppc64'" >> $cross
-            ;;
         *)
             echo "cpu_family = '$ARCH'" >> $cross
             ;;

tests/tcg/configure.sh

@@ -64,7 +64,9 @@ fi
 : ${cross_cc_ppc="powerpc-linux-gnu-gcc"}
 : ${cross_cc_cflags_ppc="-m32"}
 : ${cross_cc_ppc64="powerpc64-linux-gnu-gcc"}
-: ${cross_cc_ppc64le="powerpc64le-linux-gnu-gcc"}
+: ${cross_cc_cflags_ppc64="-m64 -mbig"}
+: ${cross_cc_ppc64le="$cross_cc_ppc64"}
+: ${cross_cc_cflags_ppc64le="-m64 -mlittle"}
 : ${cross_cc_riscv64="riscv64-linux-gnu-gcc"}
 : ${cross_cc_s390x="s390x-linux-gnu-gcc"}
 : ${cross_cc_sh4="sh4-linux-gnu-gcc"}