build: remove unused FIPS export condition

Refs: https://github.com/nodejs/node/pull/64777#pullrequestreview-5645113536
Signed-off-by: Filip Skokan <panva.ip@gmail.com>
PR-URL: https://github.com/nodejs/node/pull/67005
Reviewed-By: Richard Lau <richard.lau@ibm.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>

node.gyp

@@ -966,11 +966,6 @@
               '-Bdeps/zlib/win32/zlib.def'
             ],
           },
-          'conditions': [
-            ['openssl_is_fips=="true"', {
-              'variables': { 'mkssldef_flags': ['-DOPENSSL_FIPS'] },
-            }],
-          ],
           'actions': [
             {
               'action_name': 'mkssldef',