fix(build): Ignore noexcept-type for malloc_ptr_t

Since all of polybar is built at once, there is no chance that this is
ever linked to an object that was compiled with another `-std=`

Ref: https://stackoverflow.com/a/46857525/5363071

include/utils/memory.hpp

@@ -12,11 +12,20 @@ using malloc_ptr_t = shared_ptr<T>;
 namespace memory_util {
   /**
    * Create a shared pointer using malloc/free
+   *
+   * Generates a noexcept-type warning because the mangled name for
+   * malloc_ptr_t will change in C++17. This doesn't affect use because we have
+   * no public ABI, so we ignore it here.
+   * See also this SO answer: https://stackoverflow.com/a/46857525/5363071
    */
+
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wnoexcept-type"
   template <typename T, size_t Size = sizeof(T), typename Deleter = decltype(std::free)>
   inline malloc_ptr_t<T> make_malloc_ptr(Deleter deleter = std::free) {
     return malloc_ptr_t<T>(static_cast<T*>(calloc(1, Size)), deleter);
   }
+#pragma GCC diagnostic pop
 
   /**
    * Get the number of elements in T
@@ -25,6 +34,6 @@ namespace memory_util {
   inline auto countof(T& p) {
     return sizeof(p) / sizeof(p[0]);
   }
-}
+}  // namespace memory_util
 
 POLYBAR_NS_END