remove buffer from src/hdr buffer list if the buffer is killed

[0x17de]

Once the buffer was killed it should be removed from the list of source and header buffers; Otherwise a new call to cmake-ide-run-cmake will cause minor issues since the file is closed while trying to apply new flags.

[coveralls]

Pull Request Test Coverage Report for Build 297

• 1 of 4 (25.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.3%) to 68.271%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
cmake-ide.el	1	4	25.0%

Totals
Change from base Build 296:	-0.3%
Covered Lines:	383
Relevant Lines:	561

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 297

• 1 of 4 (25.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.3%) to 68.271%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
cmake-ide.el	1	4	25.0%

Totals
Change from base Build 296:	-0.3%
Covered Lines:	383
Relevant Lines:	561

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 297

• 1 of 4 (25.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.3%) to 68.271%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
cmake-ide.el	1	4	25.0%

Totals
Change from base Build 296:	-0.3%
Covered Lines:	383
Relevant Lines:	561

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 297

• 1 of 4 (25.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.3%) to 68.271%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
cmake-ide.el	1	4	25.0%

Totals
Change from base Build 296:	-0.3%
Covered Lines:	383
Relevant Lines:	561

---

💛 - Coveralls

[atilaneves]

Looks good, but could you add a test please? I don't want a regression for this to be introduced.

[0x17de]

@atilaneves If you give me some more time I can write some test for that (maybe around late august). It could be that i need ert-async since i need to wait until cmake is successfully run

[atilaneves]

@0x17de Sure, it's your fix, so whenever you can.