Use correct compiler version flag in the autoconf script

The autoconf script prints used compiler version at the end of the
configure script.  Solaris native compiler doesn't support --version,
and -V has to be used which in turn isn't supported by Gcc/Clang.
Detect which version flag has to be used and call $CC with it.

configure.ac

@@ -1668,7 +1668,11 @@ report() {
     echo "    localstatedir: $localstatedir"
     echo "-------------------------------------------------------------------------------"
     echo "Compiler: $CC"
-    $CC --version 2>&1 | sed 's/^/    /'
+    AS_IF([test "$GCC" = "yes"],
+	  [$CC --version 2>&1 | sed 's/^/    /'],
+	  [AS_CASE([$host],
+		   [*-solaris*],[$CC -V 2>&1 | sed 's/^/    /'],
+		   [$CC --version 2>&1 | sed 's/^/    /'])])
     echo "CFLAGS: $STD_CFLAGS $CFLAGS"
     echo "CPPFLAGS: $STD_CPPFLAGS $CPPFLAGS"
     echo "LDFLAGS: $LDFLAGS"