Test extracting static objects into a shared library

This was previously broken and we didn't know it. See #1169

test cases/common/128 extract all shared library/extractor.h

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+#pragma once
+
+int func1();
+int func2();
+int func3();
+int func4();

test cases/common/128 extract all shared library/four.c

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+#include"extractor.h"
+
+int func4() {
+    return 4;
+}

test cases/common/128 extract all shared library/func1234.def

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+EXPORTS
+	func1
+	func2
+	func3
+	func4

test cases/common/128 extract all shared library/meson.build

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+project('extract all', 'c', 'cpp')
+
+a = static_library('a', 'one.c', 'two.c')
+b = static_library('b', 'three.c', 'four.c')
+c = shared_library('c',
+  objects : [a.extract_all_objects(), b.extract_all_objects()],
+  vs_module_defs : 'func1234.def')
+
+e = executable('proggie', 'prog.c', link_with : c)
+test('extall', e)

test cases/common/128 extract all shared library/one.c

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+#include"extractor.h"
+
+int func1() {
+    return 1;
+}

test cases/common/128 extract all shared library/prog.c

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+#include"extractor.h"
+#include<stdio.h>
+
+int main(int argc, char **argv) {
+    if((1+2+3+4) != (func1() + func2() + func3() + func4())) {
+        printf("Arithmetic is fail.\n");
+        return 1;
+    }
+    return 0;
+}

test cases/common/128 extract all shared library/three.c

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+#include"extractor.h"
+
+int func3() {
+    return 3;
+}

test cases/common/128 extract all shared library/two.c

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+#include"extractor.h"
+
+int func2() {
+    return 2;
+}