fix cmake build

ios/flutter_qjs.podspec

@@ -14,13 +14,12 @@ This plugin is a simple js engine for flutter using the `quickjs` project. Plugi
   s.author           = { 'ekibun' => 'soekibun@gmail.com' }
   s.source           = { :path => '.' }
   s.compiler_flags = '-DDUMP_LEAKS'
-  s.source_files = ['Classes/**/*', 'cxx/*']
-  s.public_header_files = 'Classes/**/*.h'
+  s.source_files = ['Classes/**/*', 'cxx/*.{c,cpp}']
   s.dependency 'Flutter'
   s.platform = :ios, '8.0'
 
   # Flutter.framework does not contain a i386 slice.
   s.pod_target_xcconfig = { 'DEFINES_MODULE' => 'YES', 'EXCLUDED_ARCHS[sdk=iphonesimulator*]' => 'i386' }
-  s.prepare_command = 'sh pre.sh'
+  s.prepare_command = 'sh ../cxx/prebuild.sh'
   s.swift_version = '5.0'
 end

ios/pre.sh

@@ -1,33 +0,0 @@
-if [ -d "./cxx/" ];then
-    rm -r ./cxx
-fi
-
-mkdir ./cxx
-
-sed 's/\#include \"quickjs\/quickjs.h\"/\#include \"quickjs.h\"/g' ../cxx/ffi.h > ./cxx/ffi.h
-cp ../cxx/ffi.cpp ./cxx/ffi.cpp
-
-quickjs_version=$(cat ../cxx/quickjs/VERSION)
-
-sed '1i\
-\#define CONFIG_VERSION \"'$quickjs_version'\"\
-' ../cxx/quickjs/quickjs.c > ./cxx/quickjs.c
-
-quickjs_src=(
-    "list.h"
-    "cutils.c"
-    "libregexp.c"
-    "libunicode.c"
-    "cutils.h"
-    "libregexp.h"
-    "libunicode.h"
-    "quickjs.h"
-    "quickjs-atom.h"
-    "quickjs-opcode.h"
-    "libregexp-opcode.h"
-    "libunicode-table.h"
-)
-for item in ${quickjs_src[*]}
-do
-    cp ../cxx/quickjs/$item ./cxx/$item
-done