Stop setting LDFLAGS/CPPFLAGS to include brew directories

Let the build systems figure them out!

Author: d-torrance

.github/workflows/test_build.yml

@@ -118,8 +118,6 @@ jobs:
                echo `brew --prefix make  `/libexec/gnubin >> $GITHUB_PATH
                echo `brew --prefix libtool`/libexec/gnubin >> $GITHUB_PATH
                echo `brew --prefix bison`/bin             >> $GITHUB_PATH
-               echo "CPPFLAGS=-I$(brew --prefix)/include -I$(brew --prefix libomp)/include -I$(brew --prefix readline)/include" >> $GITHUB_ENV
-               echo "LDFLAGS= -L$(brew --prefix)/lib     -L$(brew --prefix libomp)/lib     -L$(brew --prefix readline)/lib"     >> $GITHUB_ENV
           fi
 
       - uses: actions/cache@v4