Use --strip-unneeded when stripping static libraries with GNU strip.

We've long used "--strip-unneeded" for shared libraries but plain
"-x" for static libraries when stripping symbols with GNU strip.
There doesn't seem to be any really good reason for that though,
since --strip-unneeded produces smaller output (as "-x" alone
does not remove debug symbols).  Moreover it seems that
llvm-strip, although it identifies as GNU strip, misbehaves when
given "-x" for this purpose.  It's unclear whether that's
intentional or a bug in llvm-strip, but in any case it seems like
changing to use --strip-unneeded in all cases should be a win.

Note that this doesn't change our behavior when dealing with
non-GNU strip.

Per gripes from Ed Maste and Palle Girgensohn.  Back-patch,
in case anyone wants to use llvm-strip with stable branches.

Discussion: https://postgr.es/m/17898-5308d09543463266@postgresql.org
Discussion: https://postgr.es/m/20230420153338.bbj2g5jiyy3afhjz@awork3.anarazel.de

config/programs.m4

@@ -327,7 +327,7 @@ AC_DEFUN([PGAC_CHECK_STRIP],
 
   AC_MSG_CHECKING([whether it is possible to strip libraries])
   if test x"$STRIP" != x"" && "$STRIP" -V 2>&1 | grep "GNU strip" >/dev/null; then
-    STRIP_STATIC_LIB="$STRIP -x"
+    STRIP_STATIC_LIB="$STRIP --strip-unneeded"
     STRIP_SHARED_LIB="$STRIP --strip-unneeded"
     AC_MSG_RESULT(yes)
   else

configure

@@ -9502,7 +9502,7 @@ fi
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether it is possible to strip libraries" >&5
 $as_echo_n "checking whether it is possible to strip libraries... " >&6; }
   if test x"$STRIP" != x"" && "$STRIP" -V 2>&1 | grep "GNU strip" >/dev/null; then
-    STRIP_STATIC_LIB="$STRIP -x"
+    STRIP_STATIC_LIB="$STRIP --strip-unneeded"
     STRIP_SHARED_LIB="$STRIP --strip-unneeded"
     { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
 $as_echo "yes" >&6; }