Avoid trailing spaces in auto-generated build/cmake/setup.h.in

Tweak the sed command to ensure that "\1" in it refers only to the name
of the preprocessor symbol being defined, without all the spaces after
it.

build/update-setup-h

@@ -43,7 +43,7 @@ cat_common_options_for()
         # The setup.h.in template for cmake needs special processing
         cmd="$cmd | sed -e '/^\/\//d' \
                         -e 's@ *//.*\$@@' \
-                        -e 's/# *define \(.\+\) \+\(1\|0\) *\$/#cmakedefine01 \1/'"
+                        -e 's/# *define \([^ ]\+\) \+\(1\|0\) *\$/#cmakedefine01 \1/'"
     fi
 
     eval $cmd