Polyfills are being generated for server build

[alan-agius4]

🐞 Bug report

Command (mark with an x)

- [ ] new
- [x] build
- [ ] serve
- [ ] test
- [ ] e2e
- [ ] generate
- [ ] add
- [ ] update
- [ ] lint
- [ ] xi18n
- [ ] run
- [ ] config
- [ ] help
- [ ] version
- [ ] doc

Is this a regression?

yes

Description

Polyfills are being generated when having a server build, however we shouldn't generate them.

Date: 2019-06-04T08:52:31.166Z
Hash: 40d6d04209b2f3537e10
Time: 27115ms
chunk {0} runtime-es2015.2a9da80f15988dfadebf.js (runtime) 2.15 kB [entry] [rendered]
chunk {1} 1-es2015.71112461ea3ed228f83c.js () 1.46 kB  [rendered]
chunk {2} main-es2015.ddff0e81357d03fa041e.js (main) 243 kB [initial] [rendered]
chunk {3} polyfills-es2015.fdb02b85fcf3233e755f.js (polyfills) 36.8 kB [initial] [rendered]
chunk {4} styles.280e991c5992f8630bc9.css (styles) 0 bytes [initial] [rendered]
Hash: 02a78f600168b1b894c9
Time: 6300ms
Built at: 06/04/2019 10:52:45 AM
               Asset      Size         Chunks             Chunk Names
             main.js  33.9 KiB           main  [emitted]  main
         main.js.map  11.1 KiB           main  [emitted]  main
    polyfills-es5.js  58.7 KiB  polyfills-es5  [emitted]  polyfills-es5
polyfills-es5.js.map  18.7 KiB  polyfills-es5  [emitted]  polyfills-es5

🌍 Your Environment

Angular CLI: 8.0.1
Node: 11.0.0
OS: win32 x64
Angular: 8.0.0
... animations, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... platform-server, router

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.800.1
@angular-devkit/build-angular     0.800.1
@angular-devkit/build-optimizer   0.800.1
@angular-devkit/build-webpack     0.800.1
@angular-devkit/core              8.0.1
@angular-devkit/schematics        8.0.1
@angular/cli                      8.0.1
@ngtools/webpack                  8.0.1
@nguniversal/common               7.1.1
@nguniversal/express-engine       7.1.1
@schematics/angular               8.0.1
@schematics/update                0.800.1
rxjs                              6.5.2
typescript                        3.4.5
webpack                           4.30.0

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