build: fix sunos build, compile lua with __C99FEATURES__=1

src/Makefile

@@ -6,6 +6,8 @@ release_hdr := $(shell sh -c './mkreleasehdr.sh')
 uname_S := $(shell sh -c 'uname -s 2>/dev/null || echo not')
 OPTIMIZATION?=-O2
 
+LUA_CFLAGS=-O2 -Wall
+
 ifeq ($(uname_S),Linux)
   ifneq ($(FORCE_LIBC_MALLOC),yes)
     USE_JEMALLOC=yes
@@ -13,6 +15,8 @@ ifeq ($(uname_S),Linux)
 endif
 
 ifeq ($(uname_S),SunOS)
+  # make isinf() available
+  LUA_CFLAGS+=-D__C99FEATURES__=1
   CFLAGS?=-std=c99 -pedantic $(OPTIMIZATION) -Wall -W -D__EXTENSIONS__ -D_XPG6
   CCLINK?=-ldl -lnsl -lsocket -lm -lpthread
   DEBUG?=-g -ggdb 
@@ -163,7 +167,7 @@ dependencies:
 	@printf '%b %b\n' $(MAKECOLOR)MAKE$(ENDCOLOR) $(BINCOLOR)linenoise$(ENDCOLOR)
 	@cd ../deps/linenoise && $(MAKE) ARCH="$(ARCH)"
 	@echo $(MAKECOLOR)MAKE$(ENDCOLOR) $(BINCOLOR)Lua ansi$(ENDCOLOR)
-	@cd ../deps/lua && $(MAKE) ARCH="$(ARCH)" ansi
+	@cd ../deps/lua && $(MAKE) ARCH="$(ARCH)" CFLAGS="$(LUA_CFLAGS)" ansi
 
 ../deps/jemalloc/lib/libjemalloc.a:
 	cd ../deps/jemalloc && ./configure $(JEMALLOC_CFLAGS) --with-jemalloc-prefix=je_ --enable-cc-silence && $(MAKE) lib/libjemalloc.a