Fix Web build.

The ifeq($(TARGET_WEB),0) check on line 49 wasn't being endif'ed properly, which caused the rest of the code up until 244 (where an incorrect endif was placed) to be ignored.
This commit fixes that issue and allows web builds to work normally.

Makefile

@@ -50,6 +50,7 @@ ifeq ($(TARGET_WEB),0)
 ifeq ($(OS),Windows_NT)
 WINDOWS_BUILD := 1
 endif
+endif
 
 # Release (version) flag defs
 
@@ -241,7 +242,6 @@ OPT_FLAGS += $(BITS)
 ifeq ($(TARGET_WEB),1)
   OPT_FLAGS := -O2 -g4 --source-map-base http://localhost:8080/
 endif
-endif
 
 # Use a default opt flag for gcc, then override if RPi
 ifeq ($(COMPILER),gcc)