define git commnds only for linux

CArunGUI/CArunGUI.pro

@@ -21,14 +21,15 @@ INCLUDEPATH += ../include
 win32 {
     BUILD_DATE=$$system("date /t")
     BUILD_TIME=$$system("time /t")
+    GIT_COMMIT=""
+    EXTENDED_VERSION=""
 } else {
     BUILD_DATE=$$system("date +%d-%m-%y")
     BUILD_TIME=$$system("date +%H:%M:%S")
+    GIT_COMMIT=$$system("git log -1 --format=oneline | cut -d' ' -f1")
+    EXTENDED_VERSION="$${VERSION}-$${GIT_COMMIT}"
 }
 
-GIT_COMMIT=$$system("git log -1 --format=oneline | cut -d' ' -f1")
-
-EXTENDED_VERSION="$${VERSION}-$${GIT_COMMIT}"
 
 DEFINES+=APP_VERSION=\\\"$$VERSION\\\"
 DEFINES+=APP_BUILD_DATE=\\\"$$BUILD_DATE\\\"