fix some type conversion warnings in MSVC (#903)

doc/examples/example.c

@@ -19,6 +19,8 @@
 #if defined(WIN32)
 #include <windows.h>
 #define sleep(_t) Sleep(_t * 1000)
+#include <process.h>
+#define getpid _getpid
 #else
 #include <stdlib.h>
 #include <unistd.h>

doc/examples/fluidsynth_arpeggio.c

@@ -71,7 +71,8 @@ schedule_timer_event(void)
 void
 schedule_pattern(void)
 {
-    int i, note_time, note_duration;
+    unsigned int i;
+    int note_time, note_duration;
     note_time = time_marker;
     note_duration = duration / pattern_size;
 
@@ -135,7 +136,7 @@ main(int argc, char *argv[])
             {
                 n = atoi(argv[2]);
 
-                if((n > 1) && (n <= pattern_size))
+                if((n > 1) && (n <= (int)pattern_size))
                 {
                     pattern_size = n;
                 }

doc/examples/fluidsynth_fx.c

@@ -141,7 +141,7 @@ int main(int argc, char **argv)
 
     /* Fill in the data of the effects unit */
     fx_data.synth = synth;
-    fx_data.gain = atof(argv[2]);
+    fx_data.gain = (float)atof(argv[2]);
 
     /* Create the audio driver. As soon as the audio driver is
      * created, the synthesizer can be played. */

doc/examples/fluidsynth_metronome.c

@@ -61,7 +61,8 @@ schedule_timer_event(void)
 void
 schedule_pattern(void)
 {
-    int i, note_time;
+    unsigned int i;
+    int note_time;
     note_time = time_marker;
 
     for(i = 0; i < pattern_size; ++i)