testutil/init.c rename to testutil/testutil_init.c

Avoid conflicts with some linkers.

Signed-off-by: Patrick Steuer <patrick.steuer@de.ibm.com>

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/10439)

test/build.info

@@ -21,7 +21,7 @@ IF[{- !$disabled{tests} -}]
   SOURCE[libtestutil.a]=testutil/basic_output.c testutil/output_helpers.c \
           testutil/driver.c testutil/tests.c testutil/cb.c testutil/stanza.c \
           testutil/format_output.c testutil/tap_bio.c \
-          testutil/test_cleanup.c testutil/main.c testutil/init.c \
+          testutil/test_cleanup.c testutil/main.c testutil/testutil_init.c \
           testutil/options.c testutil/test_options.c \
           testutil/apps_mem.c testutil/random.c $LIBAPPSSRC
   INCLUDE[libtestutil.a]=../include ../apps/include ..