Instead of silently ignoring resolve_btfids in case of error, output a warning instead.

PKGBUILD

@@ -59,7 +59,7 @@ else
 fi
 pkgname=("${pkgbase}" "${pkgbase}-headers")
 pkgver="${_basekernel}"."${_sub}"
-pkgrel=255
+pkgrel=256
 pkgdesc='Linux-tkg'
 arch=('x86_64') # no i686 in here
 url="http://www.kernel.org/"
@@ -932,7 +932,7 @@ hackheaders() {
 
   # add resolve_btfids on 5.16+
   if [ $_basever -ge 516 ]; then
-    install -Dt "$builddir"/tools/bpf/resolve_btfids tools/bpf/resolve_btfids/resolve_btfids
+    install -Dt "$builddir"/tools/bpf/resolve_btfids tools/bpf/resolve_btfids/resolve_btfids || ( warning "$builddir/tools/bpf/resolve_btfids was not found. This is undesirable and might break dkms modules !!! Please review your config changes and consider using the provided defconfig and tweaks without further modification." && read -rp "Press enter to continue anyway" )
   fi
 
   msg2 "Installing headers..."