applgrid: fix aarch64-linux build

Assisted-by: Claude:opus-4.7

pkgs/by-name/ap/applgrid/no-m64.patch

@@ -0,0 +1,10 @@
+--- a/configure
++++ b/configure
+@@ -16130,7 +16130,6 @@
+ $as_echo "$as_me: WARNING: ****************************************************************" >&2;}
+ fi
+ 
+-( echo $CXXFLAGS | grep -q "m64" ) || CXXFLAGS+=" -m64 "
+ 
+ 
+ 

pkgs/by-name/ap/applgrid/package.nix

@@ -19,6 +19,14 @@ stdenv.mkDerivation (finalAttrs: {
   };
 
   patches = [
+    # Upstream's configure unconditionally injects `-m64` into CXXFLAGS, which is
+    # invalid on aarch64 (and redundant on x86_64). The line was added in r1946
+    # for applgrid 1.6.17 with the commit message "add default m64 compilation".
+    # There is no public bug tracker upstream, and the line is still present in
+    # trunk. We patch only the generated `configure` (not `configure.ac`) so
+    # that make doesn't try to re-run autotools during the build.
+    ./no-m64.patch
+
     # ROOT 6.40 made rootcling fail when no selection rules are provided
     # (https://root.cern/doc/v640/release-notes.html#core-libraries). The patch
     # appends $*LinkDef.h to the dictionary pattern rule so rootcint picks up