fix codecov ignore test dir, add pthread to appveyor cygwin

.appveyor.yml

@@ -84,6 +84,7 @@ environment:
       ADDPATH: C:\cygwin\bin;
       B2_ADDRESS_MODEL: 32
       B2_CXXSTD: 03,11,14,1z
+      B2_THREADING: threadapi=pthread
       B2_TOOLSET: gcc
 
     - FLAVOR: cygwin (64-bit)
@@ -91,6 +92,7 @@ environment:
       ADDPATH: C:\cygwin64\bin;
       B2_ADDRESS_MODEL: 64
       B2_CXXSTD: 03,11,14,1z
+      B2_THREADING: threadapi=pthread
       B2_TOOLSET: gcc
 
     - FLAVOR: mingw64

.codecov.yml

@@ -27,5 +27,5 @@ comment:
 # Ignore specific files or folders. Glob patterns are supported.
 # See https://docs.codecov.com/docs/ignoring-paths
 ignore:
-  - test/**/*
   - libs/uuid/test
+  - test/**/*