Correct typos in configure.win

Author: shikokuchuo

configure.win

@@ -7,9 +7,9 @@ for ARCH in x64 i386; do
 
   if [ -e "${R_HOME}/bin/${ARCH}/R" ]; then
     CC=`"${R_HOME}/bin/${ARCH}/R" CMD config CC`
-    CFLAGS=`"${R_HOME}/${ARCH}/bin/R" CMD config CFLAGS`
-    CPPFLAGS=`"${R_HOME}/${ARCH}/bin/R" CMD config CPPFLAGS`
-    LDFLAGS=`"${R_HOME}/${ARCH}/bin/R" CMD config LDFLAGS`
+    CFLAGS=`"${R_HOME}/bin/${ARCH}/R" CMD config CFLAGS`
+    CPPFLAGS=`"${R_HOME}/bin/${ARCH}/R" CMD config CPPFLAGS`
+    LDFLAGS=`"${R_HOME}/bin/${ARCH}/R" CMD config LDFLAGS`
     export CC CFLAGS CPPFLAGS LDFLAGS
 
     echo "Compiling 'libfswatch' from source..."