Use -Wno-cast-function-type to quiet many warnings

Author: nicowilliams

Makefile.am

@@ -20,7 +20,8 @@ LIBJQ_SRC = src/builtin.c src/bytecode.c src/compile.c src/execute.c    \
 ### C build options
 
 AM_CFLAGS = -Wextra -Wall -Wno-missing-field-initializers               \
-        -Wno-unused-parameter -Wno-unused-function
+	-Wno-unused-parameter -Wno-unused-function			\
+	-Wno-cast-function-type
 
 if WIN32
 AM_CFLAGS += -municode