Fixing the install make target. Using rm -f to ignore silently when…

… rock.exe is not there

Makefile

@@ -52,7 +52,7 @@ bootstrap:
 
 # Copy the manpage and create a symlink to the binary
 install:
-	if [ -e ${BIN_INSTALL_PATH}/rock ]; then echo "${BIN_INSTALL_PATH}/rock already exists, overwriting."; rm ${BIN_INSTALL_PATH}/rock ${BIN_INSTALL_PATH}/rock.exe; fi
+	if [ -e ${BIN_INSTALL_PATH}/rock ]; then echo "${BIN_INSTALL_PATH}/rock already exists, overwriting."; rm -f ${BIN_INSTALL_PATH}/rock ${BIN_INSTALL_PATH}/rock.exe; fi
 	ln -s $(shell pwd)/bin/rock* ${BIN_INSTALL_PATH}/
 	install -d ${MAN_INSTALL_PATH}
 	install docs/rock.1 ${MAN_INSTALL_PATH}/