simplify PATCHES handling, fixes "make ci"

Makefile

@@ -3,7 +3,7 @@
 default: tag build
 
 # patches since last release tag (as a haskell string literal)
-PATCHES:="\"`expr \`darcs changes --count --from-tag=\\\\\.\` - 1`\""
+PATCHES:=`expr \`darcs changes --count --from-tag=\\\\\.\` - 1`
 
 # build the normal hledger binary
 BUILD=ghc --make hledger.hs -o hledger -O

Version.hs

@@ -4,14 +4,12 @@ where
 import Ledger.Utils
 import Options (progname)
 
-#ifndef PATCHES
-#define PATCHES "0"
-#endif
-
 -- updated by build process from VERSION
 version       = "0.3.99"
 -- PATCHES defined by build process from repo state
-buildversion  = version ++ "." ++ PATCHES
+buildversion  = version ++ "." ++ "\
+PATCHES\
+"
 
 versionstr    = prettify $ splitAtElement '.' buildversion
                 where

hledger.cabal

@@ -58,7 +58,7 @@ Executable hledger
                   Ledger.Types
                   Ledger.Utils
   -- the cabal build does not yet report patches since last release
-  cpp-options:    -DPATCHES="0"
+  cpp-options:    -DPATCHES=0
   if flag(vty)
     Build-Depends:vty>=3.1.8.2
     Other-Modules:UICommand