Add test for installation of libraries in subprojects

The original test's subproject-install check had to be removed because
library names are now properly platform-specific

test cases/linuxlike/8 subproject library install/installed_files.txt

@@ -0,0 +1,3 @@
+usr/lib/libsublib.so
+usr/lib/libsublib.so.5
+usr/lib/libsublib.so.2.1.0

test cases/linuxlike/8 subproject library install/meson.build

@@ -0,0 +1,6 @@
+project('subproj lib install', 'c',
+  version : '2.3.4',
+  license : 'mylicense')
+
+# Test that the subproject library gets installed
+subproject('sublib', version : '1.0.0')

test cases/linuxlike/8 subproject library install/subprojects/sublib/include/subdefs.h

@@ -0,0 +1,21 @@
+#ifndef SUBDEFS_H_
+#define SUBDEFS_H_
+
+#if defined _WIN32 || defined __CYGWIN__
+#if defined BUILDING_SUB
+  #define DLL_PUBLIC __declspec(dllexport)
+#else
+  #define DLL_PUBLIC __declspec(dllimport)
+#endif
+#else
+  #if defined __GNUC__
+    #define DLL_PUBLIC __attribute__ ((visibility("default")))
+  #else
+    #pragma message ("Compiler does not support symbol visibility.")
+    #define DLL_PUBLIC
+  #endif
+#endif
+
+int DLL_PUBLIC subfunc();
+
+#endif

test cases/linuxlike/8 subproject library install/subprojects/sublib/meson.build

@@ -0,0 +1,10 @@
+project('subproject', 'c',
+  version : '1.0.0',
+  license : ['sublicense1', 'sublicense2'])
+
+i = include_directories('include')
+shared_library('sublib', 'sublib.c',
+  version : '2.1.0',
+  soversion : 5,
+  include_directories : i, install : true,
+  c_args : '-DBUILDING_SUB=2')

test cases/linuxlike/8 subproject library install/subprojects/sublib/sublib.c

@@ -0,0 +1,5 @@
+#include<subdefs.h>
+
+int DLL_PUBLIC subfunc() {
+    return 42;
+}