Extra directory information added in install rules

Example 1:

install_target: all FORCE
@if not exist C:$(INSTALL_ROOT)\Depot\qt-5.0.2-win32-msvc2012\qtbase\lib mkdir C:$(INSTALL_ROOT)\Depot\qt-5.0.2-win32-msvc2012\qtbase\lib & if not exist C:$(INSTALL_ROOT)\Depot\qt-5.0.2-win32-msvc2012\qtbase\lib exit 1
-$(INSTALL_FILE) "..\..\lib\Qt5Guid.prl" "C:$(INSTALL_ROOT)\Depot\qt-5.0.2-win32-msvc2012\qtbase\lib\Qt5Guid.prl"
-$(INSTALL_FILE) "..\..\lib\Qt5Guid.lib" "C:$(INSTALL_ROOT)\Depot\qt-5.0.2-win32-msvc2012\qtbase\lib\Qt5Guid.lib"
-$(INSTALL_FILE) "$(DESTDIR_TARGET)" "C:$(INSTALL_ROOT)\Depot\qt-5.0.2-win32-msvc2012\qtbase\lib\$(TARGET)"
-$(INSTALL_FILE) "..\..\lib\Qt5Guid.pdb" "C:$(INSTALL_ROOT)\Depot\qt-5.0.2-win32-msvc2012\qtbase\lib\Qt5Guid.pdb"

rules should not include c: or \Depot\qt-5.0.2-win32-msvc2012

Example 2:

install_target: first FORCE
@test -d $(INSTALL_ROOT)/home/rutledge/dev/qt5-android/qtbase/examples/touch/fingerpaint || mkdir -p $(INSTALL_ROOT)/home/rutledge/dev/qt5-android/qtbase/examples/touch/fingerpaint
-$(INSTALL_PROGRAM) "$(QMAKE_TARGET)" "$(INSTALL_ROOT)/home/rutledge/dev/qt5-android/qtbase/examples/touch/fingerpaint/$(QMAKE_TARGET)"

rules should not include /home/rutledge/dev/qt5-android