Fix yscale out of bounds rounding error (#12)

* Fix rounding error causing yscale out of bounds
* Ignore linux build output

.gitignore

@@ -23,3 +23,13 @@
 /output/sav/*.sav
 /output/fcs/*.fc*
 /vc/userconfig/scmrev.h
+
+# linux build output
+bin
+src/fceux
+fceux-net-server
+*.o
+.sconf_temp/
+.sconsign.dblite
+.deps
+.dirstamp

src/attic/pc/sdl-video.c

@@ -174,7 +174,7 @@ int InitVideo(FCEUGI *gi)
   #ifdef OPENGL
   if( (usingogl && !_stretchy) || !usingogl)
   #endif
-   if(_yres<tlines*eys || eys <= 0.01)
+   if(_yres < (int)(tlines*eys) || eys <= 0.01)
    {
     FCEUD_PrintError("yscale out of bounds.");
     KillVideo();

src/drivers/sdl/sdl-video.cpp

@@ -319,7 +319,7 @@ InitVideo(FCEUGI *gi)
 #ifdef OPENGL
 		if((s_useOpenGL && !ystretch) || !s_useOpenGL)
 #endif
-			if(yres < s_tlines * s_eys || s_eys <= 0.01) {
+			if(yres < int(s_tlines * s_eys) || s_eys <= 0.01) {
 				FCEUD_PrintError("yscale out of bounds.");
 				KillVideo();
 				return -1;