CI: Re-enable caching for *fixed* versions of apr/apr-util which

should now work correctly (since the version is in the cache key).
For 1.x branches, CLEAR_CACHE must still be used. [skip ci]

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1916053 13f79535-47bb-0310-9956-ffa450edef68
(cherry picked from commit 3b6f3ae)

Author: notroj

.github/workflows/linux.yml

@@ -80,7 +80,6 @@ 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
@@ -151,7 +150,6 @@ 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