Include limits.h when needed

Fixes #472

src/detection/brightness/brightness_linux.c

@@ -3,6 +3,7 @@
 
 #include <dirent.h>
 #include <ctype.h>
+#include <limits.h>
 
 const char* ffDetectBrightness(FF_MAYBE_UNUSED FFlist* result)
 {

src/detection/gtk_qt/qt.c

@@ -101,6 +101,7 @@ static void detectPlasma(const FFinstance* instance, FFQtResult* result)
         ffStrbufAppendS(&baseDir, "plasma-org.kde.plasma.desktop-appletsrc");
 
         ffParsePropFile(baseDir.chars, "Image=", &result->wallpaper);
+        puts(result->wallpaper.chars);
 
         if(allValuesSet(result))
         {

src/logo/image/image.c

@@ -2,6 +2,8 @@
 #include "common/io/io.h"
 #include "common/printing.h"
 
+#include <limits.h>
+
 #ifdef __APPLE__
     #include <sys/syslimits.h>
 #elif _WIN32