Merge r1913016 from trunk: [RTC exception for CI changes]

Work around caching issue for CI builds with both apr&apr-util 
built from source.




git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1913017 13f79535-47bb-0310-9956-ffa450edef68

.github/workflows/linux.yml

@@ -80,6 +80,7 @@ jobs:
               APR_VERSION=1.7.4
               APU_VERSION=1.6.3
               APU_CONFIG="--with-crypto --with-ldap"
+              CLEAR_CACHE=1
           # -------------------------------------------------------------------------
           - name: APR 1.8.x, APR-util 1.7.x
             config: --enable-mods-shared=reallyall
@@ -150,6 +151,7 @@ jobs:
               TEST_LDAP=1
               TEST_ARGS="-defines LDAP"
               TESTS="t/modules/"
+              CLEAR_CACHE=1
           # -------------------------------------------------------------------------
           - name: APR trunk thread debugging
             config: --enable-mods-shared=reallyall --with-mpm=event