Fix build with GNU Make 4.3:

https://github.com/Aegisub/Aegisub/issues/171

Patch taken from upstream:

https://github.com/Aegisub/Aegisub/commit/6bd3f4c26b8fc1f76a8b797fcee11e7611d59a39

diff --git a/Makefile.target b/Makefile.target
--- a/Makefile.target
+++ b/Makefile.target
@@ -112,7 +112,7 @@ POST_FLAGS = $($@_FLAGS) -c -o $@ $<
 # Libraries contain all object files they depend on (but they may depend on other files)
 # Not using libtool on OS X because it has an unsilenceable warning about a
 # compatibility issue with BSD 4.3 (wtf)
-lib%.a: $$($$*_OBJ)
+lib%.a: $$($$(*F)_OBJ)
 	@$(BIN_MKDIR_P) $(dir $@)
 	$(BIN_AR) cru $@ $(filter %.o,$^)
 	$(BIN_RANLIB) $@
b5b9b48befe93920d61e8635'/><select name='h' onchange='this.form.submit();'>
<option value='koszko' selected='selected'>koszko</option>
<option value='koszko-scripts'>koszko-scripts</option>
</select> <input type='submit' value='switch'/></form></td></tr>
<tr><td class='sub'>Wojtek's customized Guix</td><td class='sub right'></td></tr></table>
<table class='tabs'><tr><td>
<a href='/guix/about/'>about</a><a href='/guix/'>summary</a><a href='/guix/refs/?id=d7e9410cf551fabfb5b9b48befe93920d61e8635'>refs</a><a class='active' href='/guix/log/build-aux/compile-all.scm'>log</a><a href='/guix/tree/build-aux/compile-all.scm?id=d7e9410cf551fabfb5b9b48befe93920d61e8635'>tree</a><a href='/guix/commit/build-aux/compile-all.scm?id=d7e9410cf551fabfb5b9b48befe93920d61e8635'>commit</a><a href='/guix/diff/build-aux/compile-all.scm?id=d7e9410cf551fabfb5b9b48befe93920d61e8635'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/build-aux/compile-all.scm'>
<input type='hidden' name='id' value='d7e9410cf551fabfb5b9b48befe93920d61e8635'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=d7e9410cf551fabfb5b9b48befe93920d61e8635'>root</a>/<a href='/guix/log/build-aux?id=d7e9410cf551fabfb5b9b48befe93920d61e8635'>build-aux</a>/<a href='/guix/log/build-aux/compile-all.scm?id=d7e9410cf551fabfb5b9b48befe93920d61e8635'>compile-all.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/build-aux/compile-all.scm?id=d7e9410cf551fabfb5b9b48befe93920d61e8635&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-06-23 23:35:27 +0200'>2021-06-23</span></td><td><a href='/guix/commit/build-aux/compile-all.scm?id=ef82ba9dd94369926eb13325d5e7da4306d23dd7'>build: Makefile splits Scheme compilation in four steps.</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes &lt;https://bugs.gnu.org/48963&gt;.
Reported by Julien Lepiller &lt;julien@lepiller.eu&gt;.

This reduces peak memory consumption to something less unreasonable.

* Makefile.am (make-go): Depend on 'make-*-go' targets; remove body.
(guile-compilation-rule): New function.
(MODULES_CORE, MODULES_PACKAGES, MODULES_SYSTEM, MODULES_CLI): New
variables.
&lt;top level&gt;: Call 'guile-compilation-rule' 4 times.
* build-aux/compile-all.scm &lt;top level&gt;: Expect "--total" and
"--processed".  Take them into account when displaying progress
reports.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2021-06-18 14:18:06 +0200'>2021-06-18</span></td><td><a href='/guix/commit/build-aux/compile-all.scm?id=003728cfab907be5df1411c5faaf466a2b8d5ba2'>build: Remove Guile 2.2 workaround.</a><span class='msg-avail'>...<span class='msg-tooltip'>* build-aux/compile-all.scm &lt;top level&gt;: Remove Guile 2.2 workaround.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2020-04-12 00:00:59 +0200'>2020-04-12</span></td><td><a href='/guix/commit/build-aux/compile-all.scm?id=27a1e4fd109f6df9f687958cfead0d3e41e330aa'>build: Cap build parallelism on i686.</a><span class='msg-avail'>...<span class='msg-tooltip'>Works around &lt;https://bugs.gnu.org/40522&gt;.

* build-aux/compile-all.scm (parallel-job-count*): New procedure.
&lt;top level&gt;: Use it instead of 'parallel-job-count'.
</span></span></td><td>Ludovic Courtès</td></tr>