some fixes for static analysis findings; fix for brace expansion being too greedy checking sequence expressions; fix for strip targets when cross-compiling

tests/braces.right

@@ -74,6 +74,10 @@ z x v t r p n l j h f d b
 {a..1} {a..2} {a..3} {a..4} {c..1} {c..2} {c..3} {c..4}
 {1..4} {2..4} {3..4}
 {6..7} {6..8} {6..9}
+a ../a.cfg
+a.. /a.cfg
+a..b /a.cfg
+a b../a.cfg
 {abcde.f}
 X{..a}Z
 0{1..}2

tests/braces.tests

@@ -141,6 +141,12 @@ echo {{a,c}..{1..4}}
 echo {{1,2,3}..4}
 echo {6..{7,8,9}}
 
+# these are not valid sequence expressions but are valid brace expansions
+echo {a,../a.cfg}
+echo {a..,/a.cfg}
+echo {a..b,/a.cfg}
+echo {a,b../a.cfg}
+
 # these are all invalid brace expansions
 
 echo {abcde.f}