Prevent inlining for more functions.

Clang is inlining quite aggressively.

src/ldpreload.h

@@ -30,6 +30,12 @@
 #include <dlfcn.h>
 #include <errno.h>
 
+static void *dlsym_function(char const *name)
+#ifdef HAVE___ATTRIBUTE__
+                                              __attribute__((noinline))
+#endif
+;
+
 /* Load the function name using dlsym() and return it. Terminate program on
  * failure. Split in function and macro to reduce code inserted into the
  * function using the macro. */