revert AipGen.cpp:

genAttributesTemplate and genEncoderImpl are the function which are used
to generate relative .h file,if they are modifed as canonical
rule,sometimes will not generate relative file.

external/android-emugl/host/tools/emugen/ApiGen.cpp

@@ -21,8 +21,6 @@
 #include <errno.h>
 #include <sys/types.h>
 
-#include <limits.h>
-
 /* Define this to 1 to enable support for the 'isLarge' variable flag
  * that instructs the encoder to send large data buffers by a direct
  * write through the pipe (i.e. without copying it into a temporary
@@ -288,15 +286,9 @@ int ApiGen::genOpcodes(const std::string &filename)
 }
 int ApiGen::genAttributesTemplate(const std::string &filename )
 {
-    const char* untrustPath = filename.c_str();
-    char path[PATH_MAX] = {0};
-    if(realpath(untrustPath, path) == NULL) {
-        return -1;
-    }
-
-    FILE *fp = fopen(path, "wt");
+    FILE *fp = fopen(filename.c_str(), "wt");
     if (fp == NULL) {
-        perror(path);
+        perror(filename.c_str());
         return -1;
     }
 
@@ -462,15 +454,9 @@ static void writeEncodingChecksumValidatorOnReturn(const char* funcName, FILE* f
 
 int ApiGen::genEncoderImpl(const std::string &filename)
 {
-    const char* untrustPath = filename.c_str();
-    char path[PATH_MAX] = {0};
-    if(realpath(untrustPath, path) == NULL) {
-        return -1;
-    }
-
-    FILE *fp = fopen(path, "wt");
+    FILE *fp = fopen(filename.c_str(), "wt");
     if (fp == NULL) {
-        perror(path);
+        perror(filename.c_str());
         return -1;
     }
 
@@ -1347,7 +1333,7 @@ int ApiGen::readAttributes(const std::string & attribFilename)
             break;
         }
     }
-    
+
     fclose(fp);
     return 0;
 }