HostOsInfo: Add some more useful abstractions.

Namely:
- path list separator
- executable suffix
- file name case sensitivity

All of these are duplicated in various places in the current Creator
code.

Change-Id: I86eb4662fa3c2071759bd728cae1aaf7111ae686
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@nokia.com>

src/plugins/android/androidconstants.h

@@ -45,10 +45,8 @@ enum AndroidQemuStatus {
 };
 
 #ifdef Q_OS_WIN32
-#define ANDROID_EXE_SUFFIX ".exe"
 #define ANDROID_BAT_SUFFIX ".bat"
 #else
-#define ANDROID_EXE_SUFFIX ""
 #define ANDROID_BAT_SUFFIX ""
 #endif