[build] Don't fail when passed --disable-lcov and lcov isn't available #11611

1. 
   fanquake commented at 6:19 AM on November 5, 2017: member

   Fixes #10828 As pointed out in #10828, failing with "lcov not found" when we've been passed --disable-lcov doesn't make sense. Master currently behaves like this (where lcov isn't available):

   ./configure --disable-lcov
   checking for pkg-config... /usr/local/bin/pkg-config
   checking pkg-config is at least version 0.9.0... yes
   configure: error: "lcov testing requested but lcov not found"
   

   cc @janstary

2. [build] Don't fail when passed --disable-lcov and lcov isn't available 223a4aabd3
3. fanquake added the label Build system on Nov 5, 2017
4. fanquake requested review from theuni on Nov 5, 2017
5. 
   laanwj commented at 5:43 PM on November 5, 2017: member

   utACK

6. 
   promag commented at 12:03 AM on November 6, 2017: member

   Tested ACK 223a4aa.

7. laanwj merged this on Nov 6, 2017
8. laanwj closed this on Nov 6, 2017

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9. laanwj referenced this in commit 0e707919f5 on Nov 6, 2017
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13. 
    janstary commented at 7:47 PM on January 5, 2020: none

    Saying "lcov testing requested" makes no sense either if the user explicitly said --disable-lconv

14. PastaPastaPasta referenced this in commit 186855e218 on Jan 12, 2020
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