minor Makefile improvements

Makefile

@@ -1,7 +1,7 @@
 CFLAGS  := -std=c99 -Wall -O2 -D_REENTRANT
 LIBS    := -lpthread -lm -lcrypto -lssl
 
-TARGET  := $(shell uname -s | tr [A-Z] [a-z] 2>/dev/null || echo unknown)
+TARGET  := $(shell uname -s | tr '[A-Z]' '[a-z]' 2>/dev/null || echo unknown)
 
 ifeq ($(TARGET), sunos)
 	CFLAGS += -D_PTHREADS -D_POSIX_C_SOURCE=200112L
@@ -25,8 +25,8 @@ OBJ  := $(patsubst %.c,$(ODIR)/%.o,$(SRC)) $(ODIR)/bytecode.o
 
 LDIR     = deps/luajit/src
 LIBS    := -lluajit $(LIBS)
-CFLAGS  += -I $(LDIR)
-LDFLAGS += -L $(LDIR)
+CFLAGS  += -I$(LDIR)
+LDFLAGS += -L$(LDIR)
 
 all: $(BIN)