manual c function interop

examples/interop/manual/main.bro

@@ -0,0 +1,5 @@
+foreign_add :: c func(a, b i32) i32
+
+main :: func() i32 {
+	return foreign_add(20, 22)
+}

examples/interop/manual/native.c

@@ -0,0 +1,3 @@
+int foreign_add(int a, int b) {
+	return a + b;
+}

examples/packages/foreign_duplicate/app/main.bro

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+import "../left"
+import "../right"
+
+main :: func() void {
+	_ = left.same()
+	_ = right.same()
+}

examples/packages/foreign_duplicate/left/left.bro

@@ -0,0 +1 @@
+same :: c func() i32

examples/packages/foreign_duplicate/right/right.bro

@@ -0,0 +1 @@
+same :: c func() i32