merge bitcoin#25612: default to using GCC tool wrappers for LTO (with GCC)

includes:
- 6fdc13c

continuation of 019c9dd from dash#6384

Author: kwvg

configure.ac

@@ -2014,5 +2014,6 @@ echo "  CPPFLAGS            = $DEBUG_CPPFLAGS $HARDENED_CPPFLAGS $CORE_CPPFLAGS
 echo "  CXX                 = $CXX"
 echo "  CXXFLAGS            = $DEBUG_CXXFLAGS $HARDENED_CXXFLAGS $WARN_CXXFLAGS $NOWARN_CXXFLAGS $ERROR_CXXFLAGS $GPROF_CXXFLAGS $CORE_CXXFLAGS $CXXFLAGS"
 echo "  LDFLAGS             = $PTHREAD_LIBS $HARDENED_LDFLAGS $GPROF_LDFLAGS $CORE_LDFLAGS $LDFLAGS"
+echo "  AR                  = $AR"
 echo "  ARFLAGS             = $ARFLAGS"
 echo

depends/config.site.in

@@ -101,7 +101,7 @@ PYTHONPATH="${depends_prefix}/native/lib/python3/dist-packages${PYTHONPATH:+${PA
 
 if test -n "@AR@"; then
   AR="@AR@"
-  ac_cv_path_ac_pt_AR="${AR}"
+  ac_cv_path_AR="${AR}"
 fi
 
 if test -n "@RANLIB@"; then
@@ -122,12 +122,12 @@ fi
 if test "@host_os@" = darwin; then
   if test -n "@OBJDUMP@"; then
     OBJDUMP="@OBJDUMP@"
-    ac_cv_path_ac_pt_OBJDUMP="${OBJDUMP}"
+    ac_cv_path_OBJDUMP="${OBJDUMP}"
   fi
 
   if test -n "@DSYMUTIL@"; then
     DSYMUTIL="@DSYMUTIL@"
-    ac_cv_path_ac_pt_DSYMUTIL="${DSYMUTIL}"
+    ac_cv_path_DSYMUTIL="${DSYMUTIL}"
   fi
 fi