cmake: Remove MAXPATHLEN define as autoconf does not provide it

Presumably it was added to the CMake system when MAXPATHLEN was still
used by code built for Windows. Currently only lib/Support/Path.inc uses
MAXPATHLEN, and it should be available on all Unices.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223139 91177308-0d34-0410-b5e6-96231b3b80d8

cmake/modules/HandleLLVMOptions.cmake

@@ -79,8 +79,6 @@ if(WIN32)
     set(LLVM_ON_WIN32 1)
     set(LLVM_ON_UNIX 0)
   endif(CYGWIN)
-  # Maximum path length is 160 for non-unicode paths
-  set(MAXPATHLEN 160)
 else(WIN32)
   if(UNIX)
     set(LLVM_ON_WIN32 0)
@@ -90,8 +88,6 @@ else(WIN32)
     else(APPLE)
       set(LLVM_HAVE_LINK_VERSION_SCRIPT 1)
     endif(APPLE)
-    # FIXME: Maximum path length is currently set to 'safe' fixed value
-    set(MAXPATHLEN 2024)
   else(UNIX)
     MESSAGE(SEND_ERROR "Unable to determine platform")
   endif(UNIX)

include/llvm/Config/config.h.cmake

@@ -539,7 +539,4 @@
 /* Define to 1 if you have the `_chsize_s' function. */
 #cmakedefine HAVE__CHSIZE_S ${HAVE__CHSIZE_S}
 
-/* Maximum path length */
-#cmakedefine MAXPATHLEN ${MAXPATHLEN}
-
 #endif