qtcreator: fix musl

srcpkgs/qtcreator/patches/musl-no-malloc_trim.patch

@@ -0,0 +1,13 @@
+--- src/app/main.cpp	2020-08-25 13:26:21.000000000 +0200
++++ src/app/main.cpp	2020-09-03 14:21:38.975668939 +0200
+@@ -718,8 +718,10 @@
+         {
+             m_trimTimer.setSingleShot(true);
+             m_trimTimer.setInterval(60000);
++#if defined(__GLIBC__)
+             // glibc may not actually free memory in free().
+             connect(&m_trimTimer, &QTimer::timeout, this, [] { malloc_trim(0); });
++#endif
+         }
+ 
+         bool eventFilter(QObject *, QEvent *e) override