configure.in: AC_REQUIRE() removed.

THANKS : Put in Atanasov

@@ -2,8 +2,9 @@ GNU mailutils THANKS file
 
 GNU mailutils has originally been written by Jakob Kaivo, Jeff Bailey and
 Sean 'Shaleh' Perry. Many people further contributed to GNU mailutils by
-reporting problems, suggesting various improvements or submitting actual 
-code. Here is a list of these people. Help us keep it complete and exempt 
+reporting problems, suggesting various improvements or submitting actual
+code. Here is a list of these people. Help us keep it complete and exempt
 of errors.
 
-Frank Belew <frb@wiw.org>
+Frank Belew       <frb@wiw.org>
+Vesselin Atanasov <vesselin@bgnet.bg>

@@ -60,8 +60,8 @@ AC_TYPE_SIZE_T
 
 dnl Check for working functions
 
-AC_REQUIRE([jm_FUNC_MALLOC])
-AC_REQUIRE([jm_FUNC_REALLOC])
+jm_FUNC_MALLOC
+jm_FUNC_REALLOC
 AC_FUNC_ALLOCA
 # Not use.
 #AC_FUNC_MEMCMP