Revert "Fix: Corrected use of XMLSTR()"

This reverts commit fd2556b4.

See libxml2's 4472c3a5a5b516aaf59b89be602fbce52756c3e9.
1 job for master in 15 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
failed #389
docker alpine
build

00:00:15

 
Name Stage Failure
failed
build Build There is an unknown failure, please try again
  openssl-dev-1.0.2p-r0:
conflicts:
libressl-dev-2.7.4-r0[pc:libcrypto=1.0.2p]
libressl-dev-2.7.4-r0[pc:libssl=1.0.2p]
libressl-dev-2.7.4-r0[pc:openssl=1.0.2p]
satisfies: world[openssl-dev]
libssh2-dev-1.8.0-r3[pc:libcrypto]
libssh2-dev-1.8.0-r3[pc:libssl]
ERROR: Job failed: exit code 4