Bug 1747970 - Remove check for lchown. r=firefox-build-system-reviewers,mhentges

HAVE_LCHOWN is only used in nsinstall.c, for a feature we don't use.
Moreover it would need to be tested with the host compiler/headers, but
function checks are tested with the target compiler/headers so it's not
necessarily accurate. Therefore, we just remove the check.

Differential Revision: https://phabricator.services.mozilla.com/D134854

old-configure.in

@@ -872,7 +872,7 @@ fi
 
 dnl Checks for library functions.
 dnl ========================================================
-AC_CHECK_FUNCS(stat64 lstat64 truncate64 statvfs64 statvfs statfs64 statfs getpagesize gmtime_r localtime_r arc4random arc4random_buf mallinfo gettid lchown setpriority strerror syscall lutimes)
+AC_CHECK_FUNCS(stat64 lstat64 truncate64 statvfs64 statvfs statfs64 statfs getpagesize gmtime_r localtime_r arc4random arc4random_buf mallinfo gettid setpriority strerror syscall lutimes)
 
 dnl check for clock_gettime(), the CLOCK_MONOTONIC clock
 AC_CACHE_CHECK(for clock_gettime(CLOCK_MONOTONIC),