Test for regressions in #249

Use two separate natives in compiled executable.

test/install/project.janet

@@ -5,6 +5,10 @@
     :name "testmod"
     :source @["testmod.c"])
 
+(declare-native
+    :name "testmod2"
+    :source @["testmod2.c"])
+
 (declare-executable
   :name "testexec"
   :entry "testexec.janet")

test/install/testexec.janet

@@ -1,5 +1,6 @@
 (use build/testmod)
+(use build/testmod2)
 
 (defn main [&]
   (print "Hello from executable!")
-  (print (get5)))
+  (print (+ (get5) (get6))))

test/install/testmod2.c

@@ -0,0 +1,40 @@
+/*
+* Copyright (c) 2020 Calvin Rose and contributors
+*
+* Permission is hereby granted, free of charge, to any person obtaining a copy
+* of this software and associated documentation files (the "Software"), to
+* deal in the Software without restriction, including without limitation the
+* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+* sell copies of the Software, and to permit persons to whom the Software is
+* furnished to do so, subject to the following conditions:
+*
+* The above copyright notice and this permission notice shall be included in
+* all copies or substantial portions of the Software.
+*
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+* IN THE SOFTWARE.
+*/
+
+/* A very simple native module */
+
+#include <janet.h>
+
+static Janet cfun_get_six(int32_t argc, Janet *argv) {
+    (void) argv;
+    janet_fixarity(argc, 0);
+    return janet_wrap_number(6.0);
+}
+
+static const JanetReg array_cfuns[] = {
+    {"get6", cfun_get_six, NULL},
+    {NULL, NULL, NULL}
+};
+
+JANET_MODULE_ENTRY(JanetTable *env) {
+    janet_cfuns(env, NULL, array_cfuns);
+}