fixed qmake warnings about deprecated use of unescaped backslashes

qgroundcontrol.pri

@@ -165,11 +165,11 @@ win32 {
     # Special settings for debug
     #CONFIG += CONSOLE
 
-    INCLUDEPATH += $$BASEDIR\lib\sdl\include \
+    INCLUDEPATH += $$BASEDIR/lib/sdl/include \
-                   $$BASEDIR\lib\opal\include #\ #\
+                   $$BASEDIR/lib/opal/include #\ #\
                    #"C:\Program Files\Microsoft SDKs\Windows\v7.0\Include"
 
-    LIBS += -L$$BASEDIR\lib\sdl\win32 \
+    LIBS += -L$$BASEDIR/lib/sdl/win32 \
              -lmingw32 -lSDLmain -lSDL -mwindows
 
 

qgroundcontrol.pro

@@ -317,9 +317,9 @@ SOURCES += src/main.cc \
 RESOURCES = mavground.qrc
 
 # Include RT-LAB Library
-win32:exists(src/lib/opalrt/OpalApi.h):exists(C:\OPAL-RT\RT-LAB7.2.4\Common\bin) { 
+win32:exists(src/lib/opalrt/OpalApi.h):exists(C:/OPAL-RT/RT-LAB7.2.4/Common/bin) {
     message("Building support for Opal-RT")
-    LIBS += -LC:\OPAL-RT\RT-LAB7.2.4\Common\bin \
+    LIBS += -LC:/OPAL-RT/RT-LAB7.2.4/Common/bin \
         -lOpalApi
     INCLUDEPATH += src/lib/opalrt
     HEADERS += src/comm/OpalRT.h \