test: fix test-module-loading-error for musl

When a compiled library file does not have the proper format, musl returns the error message ENOEXEC as 'Exec format error' but glibc returns 'file too short' if the file is under a certain size. Reference: http://git.musl-libc.org/cgit/musl/tree/src/errno/__strerror.h#n46 This patch consists of tolerating musl's error. PR-URL: #3657 Reviewed-By: Ben Noordhuis <[email protected]> Reviewed-By: Johan Bergström <[email protected]>

Author: hmalphettes

test/parallel/test-module-loading-error.js

@@ -9,6 +9,7 @@ var error_desc ={
 linux: 'file too short',
 sunos: 'unknown file type'
 };
+varmusl_errno_enoexec='Exec format error';
 
 vardlerror_msg=error_desc[process.platform];
 
@@ -20,6 +21,10 @@ if (!dlerror_msg){
 try{
 require('../fixtures/module-loading-error.node');
 }catch(e){
+if(process.platform==='linux'&&
+e.toString().indexOf(musl_errno_enoexec)!==-1){
+dlerror_msg=musl_errno_enoexec;
+}
 assert.notEqual(e.toString().indexOf(dlerror_msg),-1);
 }