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) $@
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<tr><td><span title='2018-02-21 15:02:48 +0100'>2018-02-21</span></td><td><a href='/guix/commit/gnu/packages/lout.scm?id=9a9d64eaf97609d05b52deacdbd3dfb171a29048'>gnu: lout: Update phase style.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2018-02-16 11:11:40 +0100'>2018-02-16</span></td><td><a href='/guix/commit/gnu/packages/lout.scm?id=340978d7b054dcde6c3334267b40a8293eb0ce85'>gnu: Use HTTPS for supported nongnu.org home pages.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2016-09-02 14:35:40 +0300'>2016-09-02</span></td><td><a href='/guix/commit/gnu/packages/lout.scm?id=fb0b9ff1fabb3106ff72f3fe5f531b14f96bda8d'>gnu: Use ghostscript over ghostscript-gs.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2016-07-26 23:28:55 +0200'>2016-07-26</span></td><td><a href='/guix/commit/gnu/packages/lout.scm?id=5425269bf78ba906b974a20bfbfeb3b0dd6f9598'>gnu: lout: Add input ghostscript.</a><span class='msg-avail'>...</span></td><td>Andreas Enge</td></tr>
<tr><td><span title='2016-07-26 23:09:01 +0200'>2016-07-26</span></td><td><a href='/guix/commit/gnu/packages/lout.scm?id=02b934e2c6793a64570c9f5d9fbca8baf411d569'>gnu: lout: Make ghostscript-gs a native input.</a><span class='msg-avail'>...</span></td><td>Andreas Enge</td></tr>
<tr><td><span title='2016-07-26 23:08:00 +0200'>2016-07-26</span></td><td><a href='/guix/commit/gnu/packages/lout.scm?id=5ef469ce317a1915e135dd0eff38b42ffad06770'>gnu: lout: Build with ghostscript-gs.</a><span class='msg-avail'>...</span></td><td>Andreas Enge</td></tr>