CMake: Simplify install path logic

Select correct suffix to use for pkg-config

CMakeLists.txt

@@ -51,27 +51,15 @@ set_target_properties(pugixml PROPERTIES VERSION 1.7 SOVERSION 1)
 get_target_property(PUGIXML_VERSION_STRING pugixml VERSION)
 
 if(BUILD_PKGCONFIG)
-	# Install shared library into its own directory under LIBDIR
-	install(TARGETS pugixml EXPORT pugixml-config
-		ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}/pugixml-${PUGIXML_VERSION_STRING}
-		LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}/pugixml-${PUGIXML_VERSION_STRING}
-		RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}		
-	)
-
-	# Install header files into their own directory under INCLUDEDIR
-	install(FILES ${HEADERS} DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/pugixml-${PUGIXML_VERSION_STRING})
-else()
-	# Install shared library into default LIBDIR directory
-	install(TARGETS pugixml EXPORT pugixml-config
-		ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
-		LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
-		RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}		
-	)
-
-	# Install header files into default INCLUDEDIR directory 
-	install(FILES ${HEADERS} DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
+	# Install library into its own directory under LIBDIR
+	set(INSTALL_SUFFIX /pugixml-${PUGIXML_VERSION_STRING})
 endif()
 
+install(TARGETS pugixml EXPORT pugixml-config
+	ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}${INSTALL_SUFFIX}
+	LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}${INSTALL_SUFFIX}
+	RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+install(FILES ${HEADERS} DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}${INSTALL_SUFFIX})
 install(EXPORT pugixml-config DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/pugixml)
 
 if(BUILD_PKGCONFIG)