go: Apply package exclusion equally

The exclusion logic was moved out of getGoDirs but only buildPhase was updated
causing checkPhase to possibly fail. This happened in golint as it has go
files in testdata that are meant as testdata files and not go packages to
test which caused the checkPhase to fail.

Fixes #167717

pkgs/development/go-modules/generic/default.nix

@@ -204,7 +204,7 @@ let
         if [ -n "$subPackages" ]; then
           echo "$subPackages" | sed "s,\(^\| \),\1./,g"
         else
-          find . -type f -name \*$type.go -exec dirname {} \; | grep -v "/vendor/" | sort --unique
+          find . -type f -name \*$type.go -exec dirname {} \; | grep -v "/vendor/" | sort --unique | grep -v "$exclude"
         fi
       }
 
@@ -221,7 +221,6 @@ let
           export NIX_BUILD_CORES=1
       fi
       for pkg in $(getGoDirs ""); do
-        grep -q "$exclude" <<<$pkg && continue
         echo "Building subPackage $pkg"
         buildGoDir install "$pkg"
       done

pkgs/development/go-packages/generic/default.nix

@@ -184,7 +184,7 @@ let
           echo "$subPackages" | sed "s,\(^\| \),\1$goPackagePath/,g"
         else
           pushd "$NIX_BUILD_TOP/go/src" >/dev/null
-          find "$goPackagePath" -type f -name \*$type.go -exec dirname {} \; | grep -v "/vendor/" | sort | uniq
+          find "$goPackagePath" -type f -name \*$type.go -exec dirname {} \; | grep -v "/vendor/" | sort | uniq | grep -v "$exclude"
           popd >/dev/null
         fi
       }
@@ -202,7 +202,6 @@ let
           export NIX_BUILD_CORES=1
       fi
       for pkg in $(getGoDirs ""); do
-        grep -q "$exclude" <<<$pkg && continue
         echo "Building subPackage $pkg"
         buildGoDir install "$pkg"
       done