feat: use PIC code model for shared libraries, fix shared library bugs

programs/GNUmakefile

@@ -281,8 +281,8 @@ dialogs: bearssl libc tls
 crashpad: libc
 	$(MAKE) -C src/crashpad
 
-# Build test_dl (dynamic loading test app, depends on libloader).
-test_dl: libloader libs
+# Build test_dl (dynamic loading test app, depends on libloader and shared libs).
+test_dl: libloader libs libhello
 	$(MAKE) -C src/test_dl
 
 # Install app bundles (manifests, icons, data files) into bin/apps/<name>/.