change default compilation to release for C API

Originally I was trying to add a variable to determine which mode to use but Make is very annoying and convoluted sometimes that this just made things more complicated than they needed to be. Defaulting to release mode so when the user agent(s) build the bindings, they don't have to change the mode

crates/gosub-bindings/Makefile

@@ -1,15 +1,16 @@
 # "global" compile settings
+CFLAGS_DEBUG := -std=c99 -g -Wall -Wextra -O0
+CFLAGS_RELEASE := -std=c99 -Wall -Wextra -O2
+CFLAGS := $(CFLAGS_RELEASE) # *** CONFIGURE RELEASE OR DUBUG MODE ***
+
 INCLUDE_DIR := include
 SRC_DIR := src
 CPPFLAGS := -I$(INCLUDE_DIR) -I$(INCLUDE_DIR)/nodes
-CFLAGS_DEBUG := -std=c99 -g -Wall -Wextra -O0
-CFLAGS_RELEASE := -std=c99 -Wall -Wextra -O2
-CFLAGS := $(CFLAGS_DEBUG)
 CC := gcc
 TARGET_DIR := ../../target/debug
-
 LDFLAGS := -L$(TARGET_DIR)
 NODE_SRC_DIR := $(SRC_DIR)/nodes
+
 bindings: # build gosub static library to be used externally
 	$(CC) $(CFLAGS) $(CPPFLAGS) -c $(SRC_DIR)/gosub_api.c $(SRC_DIR)/nodes.c $(NODE_SRC_DIR)/text.c
 	ar rcs libgosub.a gosub_api.o nodes.o text.o