allegro: add some hacks to make this build with llvm 19

Still builds on current i386, sparc64 and amd64 and unlocks half a dozen
more ports.

"i think this is fine" landry

games/allegro/Makefile

@@ -4,7 +4,7 @@ COMMENT =	game programming library for C/C++ developers
 
 V =		4.2.3
 DISTNAME =	allegro-$V
-REVISION =	8
+REVISION =	9
 CATEGORIES =	games devel multimedia
 SHARED_LIBS =	alleg	1.0	# 4.2
 
@@ -25,9 +25,11 @@ AUTOCONF_VERSION =	2.63
 
 SUBST_VARS =		V
 
-WANTLIB =		X11 Xcursor Xext Xpm Xxf86dga Xxf86vm c m \
+WANTLIB =		${COMPILER_LIBCXX} X11 Xcursor Xext Xpm Xxf86dga Xxf86vm c m \
 			sndio pthread
 
+LDFLAGS +=		${COMPILER_LIBCXX:S/^/-l/}
+
 CONFIGURE_ARGS =	--enable-artsdigi=no \
 			--enable-esddigi=no \
 			--enable-jackdigi=no \
@@ -38,8 +40,10 @@ CONFIGURE_ARGS =	--enable-artsdigi=no \
 # XXX work around bogus configure entry with clang
 CONFIGURE_ENV =		allegro_cv_support_include_prefix=yes
 
+CONFIGURE_ENV +=	LDFLAGS="${LDFLAGS}"
+
 .if ${MACHINE_ARCH} == "i386"
-CONFIGURE_ENV +=	LDFLAGS="-Wl,-znotext"
+LDFLAGS +=		-Wl,-znotext
 .endif
 
 MAKE_ENV +=		shared_major_minor=${LIBalleg_VERSION}

games/allegro/patches/patch-configure_in

@@ -1,5 +1,6 @@
---- configure.in.orig	Sat Jul 14 21:46:22 2007
-+++ configure.in	Wed Jan 13 01:30:01 2010
+Index: configure.in
+--- configure.in.orig
++++ configure.in
 @@ -28,26 +28,26 @@ allegro_enable_asm=yes)
  dnl Enable 8-bpp color depth (default).
  AC_ARG_ENABLE(color8,
@@ -177,3 +178,12 @@
    fi
    ALLEGRO_SFLAGS="-x assembler-with-cpp"
    ALLEGRO_SHAREDLIB_CFLAGS="-fPIC -DALLEGRO_SHARED"
+@@ -858,7 +873,7 @@ AC_SUBST(ALLEGRO_SHAREDLIB_CFLAGS)
+ 
+ dnl How to compile C++ files.
+ if test "X$allegro_cv_support_cplusplus" = "Xyes"; then
+-  CXX="$CC"
++  CXX="${CXX}"
+   CXXFLAGS="-fno-exceptions $CFLAGS"
+   ALLEGRO_DEBUG_CXXFLAGS="-fno-exceptions $ALLEGRO_DEBUG_CFLAGS"
+   ALLEGRO_PROFILE_CXXFLAGS="-fno-exceptions $ALLEGRO_PROFILE_CFLAGS"