Change linker config variable: VNDK_VER

With VNDK APEX, the path for VNDK libs has been changed
from /system/lib/vndk-VER to /apex/com.android.vndk.vVER/lib

Previously, VNDK_VER is replaced with prefix(e.g. "-29"). We could
still prepend prefix("v") to the vndk version, but this change uses a
raw vndk version as the value of VNKD_VER.

Bug: 141451661
Test: m && boot (tested with cuttlefish)
Change-Id: Ibf4cf5e29b7f28e733d4b3bc15171f4359e1d2f2

linker/linker.cpp

@@ -4208,7 +4208,7 @@ static std::string get_ld_config_file_vndk_path() {
   if (insert_pos == std::string::npos) {
     insert_pos = ld_config_file_vndk.length();
   }
-  ld_config_file_vndk.insert(insert_pos, Config::get_vndk_version_string('.'));
+  ld_config_file_vndk.insert(insert_pos, Config::get_vndk_version_string("."));
   return ld_config_file_vndk;
 }
 

linker/linker_config.cpp

@@ -408,7 +408,7 @@ class Properties {
       params.push_back({ "SDK_VER", buf });
     }
 
-    static std::string vndk = Config::get_vndk_version_string('-');
+    static std::string vndk = Config::get_vndk_version_string("");
     params.push_back({ "VNDK_VER", vndk });
 
     for (auto& path : paths) {
@@ -596,11 +596,11 @@ bool Config::read_binary_config(const char* ld_config_file_path,
   return true;
 }
 
-std::string Config::get_vndk_version_string(const char delimiter) {
+std::string Config::get_vndk_version_string(const std::string& prefix) {
   std::string version = android::base::GetProperty("ro.vndk.version", "");
   if (version != "" && version != "current") {
-    //add the delimiter char in front of the string and return it.
-    return version.insert(0, 1, delimiter);
+    //add the prefix in front of the string and return it.
+    return version.insert(0, prefix);
   }
   return "";
 }

linker/linker_config.h

@@ -164,7 +164,7 @@ class Config {
                                  const Config** config,
                                  std::string* error_msg);
 
-  static std::string get_vndk_version_string(const char delimiter);
+  static std::string get_vndk_version_string(const std::string& prefix);
  private:
   void clear();