解决重复生成pcre2.h等文件导致增量编译时间增加

**【任务描述】**

## 问题背景：
当前在编译ark_js_runtime这个target的时候发现，在不做任何修改，连续执行俩次下面命令
./build.sh --product-name rk3568 --build-target ark_js_runtime

在第二次编译的时候还会比如

## 问题根因：

问题主要在于glibpcre和libpcre2这2个target会重复调用exec_script生成config.h、pcre2.h、pcre2_chartables.c，导致ninja识别到config.h、pcre2.h、pcre2_chartables.c被修改，影响依赖树上后面一系列的.o、.so的编译
```
[OHOS INFO] [14/61] CC obj/third_party/selinux/libselinux/src/libselinux/label_file.o
[OHOS INFO] [15/61] CC obj/third_party/pcre2/pcre2/src/libpcre2/pcre2_ord2utf.o
[OHOS INFO] [16/61] CC obj/third_party/selinux/libselinux/src/libselinux/regex.o
[OHOS INFO] [17/61] CC obj/third_party/pcre2/pcre2/src/libpcre2/pcre2_config.o
[OHOS INFO] [18/61] CC obj/third_party/pcre2/pcre2/src/libpcre2/pcre2_script_run.o
[OHOS INFO] [19/61] CC obj/third_party/selinux/libselinux/src/libselinux/selinux_restorecon.o
[OHOS INFO] [20/61] CC obj/third_party/pcre2/pcre2/src/libpcre2/pcre2_serialize.o
[OHOS INFO] [21/61] CC obj/third_party/pcre2/pcre2/src/libpcre2/pcre2_newline.o
[OHOS INFO] [22/61] CC obj/third_party/pcre2/pcre2/src/libpcre2/pcre2_substring.o
[OHOS INFO] [23/61] CC obj/third_party/pcre2/pcre2/src/libpcre2/pcre2_valid_utf.o
[OHOS INFO] [24/61] CC obj/third_party/pcre2/pcre2/src/libpcre2/pcre2_tables.o
[OHOS INFO] [25/61] CC obj/third_party/pcre2/pcre2/src/libpcre2/pcre2_string_utils.o
[OHOS INFO] [26/61] CC obj/third_party/pcre2/pcre2/src/libpcre2/pcre2_compile.o
[OHOS INFO] [27/61] CC obj/third_party/pcre2/pcre2/src/libpcre2/pcre2_xclass.o
[OHOS INFO] [28/61] CC obj/third_party/pcre2/pcre2/src/libpcre2/pcre2_auto_possess.o
[OHOS INFO] [29/61] CC obj/third_party/pcre2/pcre2/src/libpcre2/pcre2_ucd.o
[OHOS INFO] [30/61] CC obj/third_party/pcre2/pcre2/src/libpcre2/pcre2_substitute.o
[OHOS INFO] [31/61] SOLINK security/selinux/libpcre2.z.so
[OHOS INFO] [32/61] SOLINK security/selinux/libselinux.z.so
[OHOS INFO] [33/61] SOLINK security/selinux/librestorecon.z.so
[OHOS INFO] [34/61] SOLINK security/selinux/libload_policy.z.so
[OHOS INFO] [35/61] SOLINK startup/startup_l2/libsyspara.z.so
[OHOS INFO] [36/61] SOLINK startup/init/libbegetutil.z.so
[OHOS INFO] [37/61] SOLINK hiviewdfx/hilog_native/libhilog.so
[OHOS INFO] [38/61] SOLINK hiviewdfx/hitrace_native/libhitrace.so

```

## 解决方案
因为上面三个文件都是通过cp产生，所以通过使用md5sum对比俩个文件，如果相同则不用重新copy，减少增量编译动作

## 收益
高性能服务器，~2min
```
[OHOS INFO] window                   125        0.6%         125        0.6%    1.00
[OHOS INFO] wpa_supplicant-2.9       170        0.8%         170        0.8%    1.00
[OHOS INFO] wukong                    43        0.2%          43        0.2%    1.00
[OHOS INFO]
[OHOS INFO] c overall build overlap rate: 1.06
[OHOS INFO]
[OHOS INFO]
[OHOS INFO] rk3568 build success
[OHOS INFO] cost time: 0:02:25
=====build  successful=====

```

```
[OHOS INFO] wpa_supplicant-2.9       170        0.8%         170        0.8%    1.00
[OHOS INFO] wukong                    43        0.2%          43        0.2%    1.00
[OHOS INFO]
[OHOS INFO] c overall build overlap rate: 1.06
[OHOS INFO]
[OHOS INFO]
[OHOS INFO] rk3568 build success
[OHOS INFO] cost time: 0:04:20
=====build  successful=====

```

## 任务来源
编译构建本地增量编译效率提升

OpenHarmony/third_party_pcre2
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