for older cmake versions

[Islam0mar]

related to #185

I am using cmake version 3.10.2 ubuntu 18.04

cmake cann't recognize -B -S options, so it takes the last argument as the source.

error generated : CMake Error: The source directory "/tmp/cmake30805wdZ" does not appear to contain CMakeLists.txt

swapping the order solved this issue for me.

[coveralls]

Pull Request Test Coverage Report for Build 290

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 69.533%

---

Totals
Change from base Build 289:	0.0%
Covered Lines:	372
Relevant Lines:	535

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 290

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 69.533%

---

Totals
Change from base Build 289:	0.0%
Covered Lines:	372
Relevant Lines:	535

---

💛 - Coveralls