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Zuo: improve `provide-targets`

Instead of passing `build-path` to `build/command-line*` in the
expansion of `provide-targets`, leave it to the default
`(make-at-dir ".")`. Since the result of `make-at-dir` behaves
the same as `build-path` for a non-zero number of arguments, this
should be a backward-compatible change.

Closes #4732

--- a/lib/zuo/build.zuo

+++ b/lib/zuo/build.zuo

@@ -682,10 +682,9 @@

                                    [,targets-at-id targets-at]))

         `(,(quote-syntax module+)

           main

+          ;; builds to current directory by default:

           (,(quote-syntax build/command-line*)

-           ,targets-at-id

-           ;; builds to current directory by default:

-           build-path))))

+           ,targets-at-id))))

 (define-syntax (bounce-to-targets stx)

   (unless (and (list? stx) (= 4 (length stx)))

--- a/zuo-doc/zuo-build.scrbl

+++ b/zuo-doc/zuo-build.scrbl

@@ -572,9 +572,14 @@

 Provides @racket[targets-at-id] as @racketidfont{targets-at}, and

 creates a @racketidfont{main} submodule that runs

-@racket[(build/command-line* targets-at-id build-path)]. A script

+@racket[(build/command-line* targets-at-id)]. A script

 using @racket[provide-targets] thus works as a makefile-like script or

-as an input to a larger build.}

+as an input to a larger build.

+

+@history[#:changed "1.7" @elem{Removed @racket[build-path] as a second

+                               argument to @racket[build/command-line*] so that

+                               the default @racket[(make-at-dir ".")]

+                               is used, instead.}]}

 @defform[(bounce-to-targets config-file-expr key-symbol-expr script-file-expr)]{

--- a/zuo.c

+++ b/zuo.c

@@ -3,7 +3,7 @@

    declarations. */

 #define ZUO_VERSION 1

-#define ZUO_MINOR_VERSION 6

+#define ZUO_MINOR_VERSION 7

 #if defined(_MSC_VER) || defined(__MINGW32__)

 # define ZUO_WINDOWS