libqalculate: fix musl

srcpkgs/qalculate/patches/musl.patch

@@ -0,0 +1,10 @@
+--- libqalculate/Calculator.h.orig
++++ libqalculate/Calculator.h
+@@ -15,6 +15,7 @@
+ #include <libqalculate/includes.h>
+ #include <libqalculate/util.h>
+ #include <pthread.h>
++#include <sys/time.h>
+ 
+ /** @file */
+