Add missing header

MathiasMagnus · MathiasMagnus · commit 455a99028574 · 2022-06-06T17:15:09.000+02:00
diff --git a/lib/layer.cpp b/lib/layer.cpp
@@ -8,6 +8,7 @@
 #include <sstream>
 #include <string_view>
 #include <vector>
+#include <cstring>
 
 std::optional<std::string> get_environment(const std::string &variable) {
 #ifdef __ANDROID__
