Fix CMake recipes for libphysfs to support configurable installation locations
(C) 2016 by Jim Klimov

--- a/CMakeLists.txt.orig	2012-10-23 05:41:04.000000000 +0200
+++ b/CMakeLists.txt	2016-04-27 14:24:58.171477010 +0200
@@ -338,10 +338,12 @@
     ENDIF(wxWidgets_FOUND)
 ENDIF(PHYSFS_BUILD_WX_TEST)
 
+OPTION(CMAKE_INSTALL_LIBDIR "Relative subdir under prefix for libraries." lib)
+OPTION(CMAKE_INSTALL_BINDIR "Relative subdir under prefix for binary programs." bin)
 INSTALL(TARGETS ${PHYSFS_INSTALL_TARGETS}
-        RUNTIME DESTINATION bin
-        LIBRARY DESTINATION lib${LIB_SUFFIX}
-        ARCHIVE DESTINATION lib${LIB_SUFFIX})
+        RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+        LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+        ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
 INSTALL(FILES physfs.h DESTINATION include)
 
 FIND_PACKAGE(Doxygen)