Revert makefile changes

This reverts commit 0f81b8e
This reverts commit 8249be0

Issue is that it is creating object files in the source tree, rather 
than out of it.

Author: warmwaffles

Makefile

@@ -1,5 +1,4 @@
 SRC = sqlite3/sqlite3.c c_src/sqlite3_nif.c
-OBJ = $(SRC:.c=.o)
 
 CFLAGS ?= -g
 
@@ -45,33 +44,30 @@ PRIV_DIR = $(MIX_APP_PATH)/priv
 LIB_NAME = $(PRIV_DIR)/sqlite3_nif.so
 
 ifneq ($(CROSSCOMPILE),)
-	CFLAGS += -shared -fPIC -fvisibility=hidden
+	LIB_CFLAGS := -shared -fPIC -fvisibility=hidden
 	SO_LDFLAGS := -Wl,-soname,libsqlite3.so.0
 else
 	ifeq ($(KERNEL_NAME), Linux)
-		CFLAGS += -shared -fPIC -fvisibility=hidden
+		LIB_CFLAGS := -shared -fPIC -fvisibility=hidden
 		SO_LDFLAGS := -Wl,-soname,libsqlite3.so.0
 	endif
 	ifeq ($(KERNEL_NAME), Darwin)
-		CFLAGS += -dynamiclib -undefined dynamic_lookup
+		LIB_CFLAGS := -dynamiclib -undefined dynamic_lookup
 	endif
 	ifeq ($(KERNEL_NAME), $(filter $(KERNEL_NAME),OpenBSD FreeBSD NetBSD))
-		CFLAGS += -shared -fPIC
+		LIB_CFLAGS := -shared -fPIC
 	endif
 endif
 
-%.o: %.c
-	$(CC) $(CFLAGS) -o $@ -c $<
-
 all: $(PRIV_DIR) $(LIB_NAME)
 
-$(LIB_NAME): $(OBJ)
-	$(CC) $(CFLAGS) $(SO_LDFLAGS) $^ -o $@
+$(LIB_NAME): $(SRC)
+	$(CC) $(CFLAGS) $(LIB_CFLAGS) $(SO_LDFLAGS) $^ -o $@
 
 $(PRIV_DIR):
 	mkdir -p $@
 
 clean:
-	rm -f $(LIB_NAME) $(OBJ)
+	rm -f $(LIB_NAME)
 
 .PHONY: all clean