[PATCH] tparam configure fix

With a newer compiler the configure check for tparam/tparm fails with

conftest.c: In function 'main':
conftest.c:95:8: error: returning 'char *' from a function with return type 'int' makes integer from pointer without a cast [-Wint-conversion]
   95 | return tparam ("\033\133%dm", &buf, 1, 8);
      |        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
configure:23675: $? = 1
conftest.c: In function 'main':
conftest.c:94:8: error: returning 'char *' from a function with return type 'int' makes integer from pointer without a cast [-Wint-conversion]
   94 | return tparm ("\033\133%dm", 8);
      |        ^~~~~~~~~~~~~~~~~~~~~~~~
configure:23719: $? = 1

This causes libtextstyle to backfill these two functions from gnulib which
eventually causes a link error

ld.bfd: buildtools/complibs-host/lib/libncurses.a(lib_tparm.o): in function `tparm':
src/ncurses/ncurses/tinfo/lib_tparm.c:1093: multiple definition of `tparm'; ../lib/.libs/libtextstyle.a(tparm.o):src/gettext/libtextstyle/lib/tparm.c:256: first defined here

Update the configure check to something that will correctly determine if
tparam/tparm need to be back-filled.

Signed-off-by: Chris Packham <judge.packham@gmail.com>
---
 libtextstyle/configure |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/libtextstyle/configure
+++ b/libtextstyle/configure
@@ -23667,7 +23667,7 @@
 int
 main ()
 {
-return tparam ("\033\133%dm", &buf, 1, 8);
+return ! tparam ("\033\133%dm", &buf, 1, 8);
   ;
   return 0;
 }
@@ -23711,7 +23711,7 @@
 int
 main ()
 {
-return tparm ("\033\133%dm", 8);
+return ! tparm ("\033\133%dm", 8);
   ;
   return 0;
 }