Fix ECP alternative macro names
The compile time macros enabling the initialisation and deinitialisation
in the alternative Elliptic Curve Point arithmetic implementation had
names that did not end with '_ALT' as required by check-names.sh.
diff --git a/include/mbedtls/check_config.h b/include/mbedtls/check_config.h
index 8495ef2..6fe6d52 100644
--- a/include/mbedtls/check_config.h
+++ b/include/mbedtls/check_config.h
@@ -150,12 +150,12 @@
#error "MBEDTLS_GCM_C defined, but not all prerequisites"
#endif
-#if defined(MBEDTLS_ECP_ALT_INIT) && !defined(MBEDTLS_ECP_FUNCTION_ALT)
-#error "MBEDTLS_ECP_ALT_INIT defined, but not all prerequisites"
+#if defined(MBEDTLS_ECP_INIT_ALT) && !defined(MBEDTLS_ECP_FUNCTION_ALT)
+#error "MBEDTLS_ECP_INIT_ALT defined, but not all prerequisites"
#endif
-#if defined(MBEDTLS_ECP_ALT_DEINIT) && !defined(MBEDTLS_ECP_FUNCTION_ALT)
-#error "MBEDTLS_ECP_ALT_DEINIT defined, but not all prerequisites"
+#if defined(MBEDTLS_ECP_DEINIT_ALT) && !defined(MBEDTLS_ECP_FUNCTION_ALT)
+#error "MBEDTLS_ECP_DEINIT_ALT defined, but not all prerequisites"
#endif
#if defined(MBEDTLS_ECP_RANDOMIZE_JAC_ALT) && !defined(MBEDTLS_ECP_FUNCTION_ALT)