Fix hwloc patch application on windows

Windows `cmd.exe` doesn't have a `true` command, `(exit 0)` will do the
same thing but it will work on both linux and windows.

This issue only shows up on Windows and not on a first build, since when
building the first time the patch applies cleanly so the `||` branch is
not taken, but then when rebuilding the patch doens't apply and the
command errors out in the `||` branch.

Author: npmiller

CMakeLists.txt

@@ -136,7 +136,7 @@ elseif(WINDOWS AND NOT UMF_DISABLE_HWLOC)
         apply
         ${PROJECT_SOURCE_DIR}/cmake/fix_coverity_issues.patch
         ||
-        true)
+        (exit 0))
 
     message(STATUS "Will fetch hwloc from ${UMF_HWLOC_REPO}")
 
@@ -167,7 +167,7 @@ elseif(NOT UMF_DISABLE_HWLOC)
         apply
         ${PROJECT_SOURCE_DIR}/cmake/fix_coverity_issues.patch
         ||
-        true)
+        (exit 0))
 
     message(STATUS "Will fetch hwloc from ${UMF_HWLOC_REPO}")