HAVE_FIREBIRD_30 is not used anymore

Change-Id: If318cd33356c0082a63cbd941cdfc753c9d800e3
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/116977
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>

config_host/config_firebird.h.in

@@ -7,6 +7,4 @@ Settings for Firebird
 
 #define ENABLE_FIREBIRD_SDBC 0
 
-#define HAVE_FIREBIRD_30 0
-
 #endif

configure.ac

@@ -10127,7 +10127,6 @@ int fb_api_is_30(void) { return 0; }
         AC_MSG_RESULT([none])
     else
         dnl Embedded Firebird has version 3.0
-        AC_DEFINE(HAVE_FIREBIRD_30, 1)
         dnl We need libatomic_ops for any non X86/X64 system
         if test "${CPUNAME}" != INTEL -a "${CPUNAME}" != X86_64; then
             dnl ===================================================================