Remove redundant sizeof "size_t" check

The result variables: HAVE_${VARIABLE}, ${VARIABLE}, ${VARIABLE}_CODE,
etc. do not seem to be referenced anywhere in the CMake build script.

CMakeLists.txt

@@ -47,7 +47,6 @@ include(CheckCSourceCompiles)
 include(CheckCSourceRuns)
 include(CheckCCompilerFlag)
 include(CheckCXXCompilerFlag)
-include(CheckTypeSize)
 include(CheckStructHasMember)
 include(CMakeDependentOption)
 include(FindPkgConfig)
@@ -910,7 +909,6 @@ if(SDL_LIBC)
 
     set(STDC_HEADER_NAMES "stddef.h;stdarg.h;stdlib.h;string.h;stdio.h;wchar.h;float.h")
     check_include_files("${STDC_HEADER_NAMES}" STDC_HEADERS)
-    check_type_size("size_t" SIZEOF_SIZE_T)
     check_symbol_exists(M_PI math.h HAVE_M_PI)
     # TODO: refine the mprotect check
     check_c_source_compiles("#include <sys/types.h>