write_basic_package_version_file() now works with unset CMAKE_SIZEOF_VOID_P

This fixes #13241.
If CMAKE_SIZEOF_VOID_P is not set, either in the installed or in the
using project, don't check for it.

Alex

Modules/BasicConfigVersion-AnyNewerVersion.cmake.in

@@ -18,6 +18,11 @@ else()
   endif()
 endif()
 
+# if the installed or the using project don't have CMAKE_SIZEOF_VOID_P set, ignore it:
+if("${CMAKE_SIZEOF_VOID_P}"  STREQUAL ""  OR "@CMAKE_SIZEOF_VOID_P@" STREQUAL "")
+   return()
+endif()
+
 # check that the installed version has the same 32/64bit-ness as the one which is currently searching:
 if(NOT "${CMAKE_SIZEOF_VOID_P}"  STREQUAL  "@CMAKE_SIZEOF_VOID_P@")
    math(EXPR installedBits "@CMAKE_SIZEOF_VOID_P@ * 8")

Modules/BasicConfigVersion-ExactVersion.cmake.in

@@ -34,6 +34,11 @@ if( "${PACKAGE_FIND_VERSION}" STREQUAL "${PACKAGE_VERSION}")
 endif()
 
 
+# if the installed or the using project don't have CMAKE_SIZEOF_VOID_P set, ignore it:
+if("${CMAKE_SIZEOF_VOID_P}"  STREQUAL ""  OR "@CMAKE_SIZEOF_VOID_P@" STREQUAL "")
+   return()
+endif()
+
 # check that the installed version has the same 32/64bit-ness as the one which is currently searching:
 if(NOT "${CMAKE_SIZEOF_VOID_P}" STREQUAL "@CMAKE_SIZEOF_VOID_P@")
   math(EXPR installedBits "@CMAKE_SIZEOF_VOID_P@ * 8")

Modules/BasicConfigVersion-SameMajorVersion.cmake.in

@@ -33,6 +33,11 @@ else()
 endif()
 
 
+# if the installed or the using project don't have CMAKE_SIZEOF_VOID_P set, ignore it:
+if("${CMAKE_SIZEOF_VOID_P}"  STREQUAL ""  OR "@CMAKE_SIZEOF_VOID_P@" STREQUAL "")
+   return()
+endif()
+
 # check that the installed version has the same 32/64bit-ness as the one which is currently searching:
 if(NOT "${CMAKE_SIZEOF_VOID_P}" STREQUAL "@CMAKE_SIZEOF_VOID_P@")
   math(EXPR installedBits "@CMAKE_SIZEOF_VOID_P@ * 8")