Don't build the malo module with clang 10

Compiling it with LLVM 10 triggers https://bugs.llvm.org/show_bug.cgi?id=44351
While LLVM 11 is the default compiler, I regularly build with
CROSS_TOOLCHAIN=llvm10 or use system packages for clang on Linux/macOS and
those have not been updated to 11 yet.

sys/modules/Makefile

@@ -224,7 +224,7 @@ SUBDIR=	\
 	mac_seeotheruids \
 	mac_stub \
 	mac_test \
-	malo \
+	${_malo} \
 	md \
 	mdio \
 	mem \
@@ -804,6 +804,12 @@ _bcm283x_clkman=  bcm283x_clkman
 _bcm283x_pwm=  bcm283x_pwm
 .endif
 
+.if !(${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} < 110000)
+# LLVM 10 crashes when building if_malo_pci.c, fixed in LLVM11:
+# https://bugs.llvm.org/show_bug.cgi?id=44351
+_malo=	malo
+.endif
+
 SUBDIR+=${MODULES_EXTRA}
 
 .for reject in ${WITHOUT_MODULES}