games-arcade/xgalaga: fix AR support patch

AM_PROG_AR should be used only in build systems that use automake.
For those that don't `AC_CHECK_TOOL` is usually good enough.

Reported-by: Toralf Förster
Closes: https://bugs.gentoo.org/806382
Package-Manager: Portage-3.0.20, Repoman-3.0.3
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>

games-arcade/xgalaga/files/xgalaga-2.1.1.0-respect-AR.patch

@@ -1,10 +1,22 @@
+Allow user to specify AR. Derive ar from --host=.
 --- a/configure.in
 +++ b/configure.in
 @@ -14,6 +14,7 @@ AC_PROG_INSTALL
  AC_PROG_LN_S
  AC_PROG_MAKE_SET
  AC_PROG_RANLIB
-+AM_PROG_AR
++AC_CHECK_TOOL(AR, ar)
  
  AC_ARG_WITH(xpm-lib,[  --with-xpm-lib          Directory containing libXpm (may be autodetected)],xpm_lib=$withval)
  AC_ARG_WITH(sound,  [  --with-sound            Type of sound to use (native or nas)],sound_type=$withval)
+--- a/libsprite/Makefile.in
++++ b/libsprite/Makefile.in
+@@ -8,7 +8,7 @@ VPATH = @srcdir@
+ .SUFFIXES:
+ .SUFFIXES: .c .o
+ 
+-AR = ar
++AR = @AR@
+ AR_FLAGS = rc
+ RANLIB = @RANLIB@
+ 

games-arcade/xgalaga/xgalaga-2.1.1.0-r1.ebuild

@@ -41,10 +41,6 @@ src_prepare() {
 		-e "/SOUNDDEFS/ s:(SOUNDSRVDIR):(SOUNDSRVDIR)/bin:" \
 		-e 's:make ;:$(MAKE) ;:' \
 		Makefile.in || die "sed Makefile.in failed"
-
-	sed -i \
-		-e 's/AR = ar/AR = @AR@/' \
-		libsprite/Makefile.in || die
 }
 
 src_install() {