CI: Use LD_RUN_PATH during the httpd build to embed the path to OpenSSL

in httpd binaries, but unset it after so that it doesn't affect running
e.g. php-fpm or perl later. Should fix warning from logs when php-fpm
is executed --

[26-Jul-2024 07:43:34] NOTICE: PHP message: PHP Warning:  PHP Startup: Unable to load dynamic library 'curl.so' (tried: /usr/lib/php/20210902/curl.so (/lib/x86_64-linux-gnu/libcurl.so.4: undefined symbol: ENGINE_init, version OPENSSL_3.0.0), /usr/lib/php/20210902/curl.so.so (/usr/lib/php/20210902/curl.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0

test/travis_run_linux.sh

@@ -61,7 +61,9 @@ fi
 
 if test -v TEST_OPENSSL3; then
     CONFIG="$CONFIG --with-ssl=$HOME/root/openssl3"
-    export LD_LIBRARY_PATH=$HOME/root/openssl3/lib:$HOME/root/openssl3/lib64
+    # Temporarily set LD_RUN_PATH so that httpd/mod_ssl binaries pick
+    # up the custom OpenSSL build
+    export LD_RUN_PATH=$HOME/root/openssl3/lib:$HOME/root/openssl3/lib64
     export PATH=$HOME/root/openssl3/bin:$PATH
     openssl version
 fi
@@ -78,6 +80,14 @@ builddir=$PWD
 $srcdir/configure --prefix=$PREFIX $CONFIG
 make $MFLAGS
 
+if test -v TEST_OPENSSL3
+   # Clear the library/run paths so that anything else run during
+   # testing is not forced to use the custom OpenSSL build; e.g. perl,
+   # php-fpm, ...
+   unset LD_LIBRARY_PATH
+   unset LD_RUN_PATH
+fi
+
 if test -v TEST_INSTALL; then
    make install
    pushd $PREFIX