when building for win32 define powf() as pow() due to symbol-conflicts in win32-libm

git-svn-id: https://lmms.svn.sf.net/svnroot/lmms/trunk/lmms@1285 0778d3d1-df1d-0410-868b-ea421aaaa00d

src/core/drumsynth.cpp

@@ -25,6 +25,7 @@
 
 
 #include "drumsynth.h"
+#include "lmmsconfig.h"
 
 #include <fstream>
 #include <cstring>
@@ -34,6 +35,11 @@
 #include <stdio.h>    //sscanf(), sprintf()
 #include <stdlib.h>   //RAND_MAX
 
+#ifdef LMMS_BUILD_WIN32
+#define powf pow
+#endif
+
+
 using namespace std;
 
 #define WORD  __u16