core: condition out more in FIPS builds

Reviewed-by: NMatt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/15278)

crypto/initthread.c

@@ -33,7 +33,9 @@ extern OSSL_FUNC_core_thread_start_fn *c_thread_start;
 
 typedef struct thread_event_handler_st THREAD_EVENT_HANDLER;
 struct thread_event_handler_st {
+#ifndef FIPS_MODULE
     const void *index;
+#endif
     void *arg;
     OSSL_thread_stop_handler_fn handfn;
     THREAD_EVENT_HANDLER *next;
@@ -376,7 +378,9 @@ int ossl_init_thread_start(const void *index, void *arg,
 
     hand->handfn = handfn;
     hand->arg = arg;
+#ifndef FIPS_MODULE
     hand->index = index;
+#endif
     hand->next = *hands;
     *hands = hand;
 

include/internal/cryptlib.h

@@ -155,7 +155,9 @@ typedef struct ossl_ex_data_global_st {
 # define OSSL_LIB_CTX_DRBG_INDEX                     5
 # define OSSL_LIB_CTX_DRBG_NONCE_INDEX               6
 # define OSSL_LIB_CTX_RAND_CRNGT_INDEX               7
-# define OSSL_LIB_CTX_THREAD_EVENT_HANDLER_INDEX     8
+# ifdef FIPS_MODULE
+#  define OSSL_LIB_CTX_THREAD_EVENT_HANDLER_INDEX    8
+# endif
 # define OSSL_LIB_CTX_FIPS_PROV_INDEX                9
 # define OSSL_LIB_CTX_ENCODER_STORE_INDEX           10
 # define OSSL_LIB_CTX_DECODER_STORE_INDEX           11