github CI: install gtest with brew

No need for custom build.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

.github/workflows/on_PR_mac_matrix.yml

@@ -27,14 +27,7 @@ jobs:
         run: |
           brew install ninja
           brew install inih
-          pushd /tmp
-          curl -LO https://github.com/google/googletest/archive/release-1.8.0.tar.gz
-          tar xzf   release-1.8.0.tar.gz
-          mkdir -p  googletest-release-1.8.0/build
-          pushd     googletest-release-1.8.0/build
-          cmake .. ; make ; make install
-          popd
-          popd
+          brew install googletest
 
       - name: Build
         run: |

.github/workflows/on_PR_mac_special_builds.yml

@@ -22,14 +22,7 @@ jobs:
         run: |
           brew install ninja
           brew install inih
-          pushd /tmp
-          curl -LO https://github.com/google/googletest/archive/release-1.8.0.tar.gz
-          tar xzf   release-1.8.0.tar.gz
-          mkdir -p  googletest-release-1.8.0/build
-          pushd     googletest-release-1.8.0/build
-          cmake .. ; make ; make install
-          popd
-          popd
+          brew install googletest
 
       - name: Build
         run: |

.github/workflows/on_push_BasicWinLinMac.yml

@@ -104,14 +104,7 @@ jobs:
         run: |
           brew install ninja
           brew install inih
-          pushd /tmp
-          curl -LO https://github.com/google/googletest/archive/release-1.8.0.tar.gz
-          tar xzf   release-1.8.0.tar.gz
-          mkdir -p  googletest-release-1.8.0/build
-          pushd     googletest-release-1.8.0/build
-          cmake .. ; make ; make install
-          popd
-          popd
+          brew install googletest
 
       - name: build and compile
         run: |