File mingw64-sdrangel-define-M_PI.patch of Package mingw64-sdrangel

diff --git a/plugins/samplesource/testsource/testsourcethread.h b/plugins/samplesource/testsource/testsourcethread.h
index db506d3..0a4df27 100644
--- a/plugins/samplesource/testsource/testsourcethread.h
+++ b/plugins/samplesource/testsource/testsourcethread.h
@@ -32,6 +32,11 @@
 
 #define TESTSOURCE_THROTTLE_MS 50
 
+// HACK
+#ifndef M_PI
+#define M_PI 3.14159265358979323846
+#endif
+
 class TestSourceThread : public QThread {
 	Q_OBJECT