audio/openal-soft: fix build with lld 15 on i386

During an exp-run for llvm 15 (see bug 265425), it turned out that
audio/openal-soft failed to link with lld 15, on i386:

  : && /usr/bin/c++ -O2 -pipe -fstack-protector-strong -fno-strict-aliasing -O2 -pipe -fstack-protector-strong -fno-strict-aliasing   -DNDEBUG -Wl,--as-needed -fstack-protector-strong -Wl,-z,notext CMakeFiles/makemhr.dir/utils/makemhr/loaddef.cpp.o CMakeFiles/makemhr.dir/utils/makemhr/loadsofa.cpp.o CMakeFiles/makemhr.dir/utils/makemhr/makemhr.cpp.o -o makemhr  -Wl,-rpath,/usr/local/lib:  -pthread  libsofa-support.a  -pthread  libcommon.a  /usr/local/lib/libmysofa.so  /usr/lib/libz.so  -lm && :
  ld: error: makemhr:(.eh_frame+0x14cf): internal linker error: wrote incorrect addend value 0x3400 instead of 0x0 for dynamic relocation R_386_32 at offset 0x408417 against symbol __gxx_personality_v0

This is because lld 15 with assertions enabled (which is default on
-CURRENT) checks dynamic relocations more thoroughly, and in combination
with -z notext (which was added earlier for bug 242307) results in the
above diagnostic.

Work around it by disabling the dynamic relations checks on i386.

PR:		268495
Approved by:	maintainer timeout (2 weeks)
MFH:		2022Q4

audio/openal-soft/Makefile

@@ -23,6 +23,16 @@ CMAKE_ON=	ALSOFT_BACKEND_WAVE
 LDFLAGS+=	-Wl,--as-needed
 LDFLAGS_i386=	-Wl,-z,notext
 
+.include <bsd.port.pre.mk>
+
+# The following is actually meant for lld 15.0 and later, but the ports
+# framework does not support LINKER_TYPE and LINKER_VERSION yet.
+.if ${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} >= 150
+# Turn off checking of dynamic relocations, to avoid lld diagnostics about
+# possibly incorrect addend values.
+LDFLAGS_i386+=	-Wl,--no-check-dynamic-relocations
+.endif
+
 PLIST_SUB=	SOVERSION=${PORTVERSION}
 
 OPTIONS_DEFINE=		CONFIG EXAMPLES JACK OSS PORTAUDIO PULSEAUDIO \