chore: fix JavaScript lint errors (issue #10000) - [x] Read, understood, and followed the [contributing guidelines](https://github.com/stdlib-js/stdlib/blob/develop/CONTRIBUTING.md)

[Sid-V5]

Fixed the no-undef ESLint errors in makie-install-node-addons/lib/main.js by replacing undefined proc references with process.

Resolves #10000

Problem

Four module-scoped callback functions (onError, onFinish, stdout, stderr) reference proc, but proc is only declared as a local variable inside the plugin() function. This causes 4 ESLint no-undef errors:

35:2  error  'proc' is not defined  no-undef
48:3  error  'proc' is not defined  no-undef
60:2  error  'proc' is not defined  no-undef
70:2  error  'proc' is not defined  no-undef

Fix

The callbacks use proc.exitCode, proc.stdout.write(), and proc.stderr.write() these are operations on the Node.js global process object, not the child process spawned inside plugin(). Replaced all 4 occurrences of proc with process in the module-scoped callbacks:

 function onError( error ) {
-	proc.exitCode = 1;
+	process.exitCode = 1;

 function onFinish( code ) {
-		proc.exitCode = code;
+		process.exitCode = code;

 function stdout( data ) {
-	proc.stdout.write( data );
+	process.stdout.write( data );

 function stderr( data ) {
-	proc.stderr.write( data );
+	process.stderr.write( data );

The local var proc inside plugin() continues to hold the child process handle from spawn() and is unaffected.

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