Cleanup TRAVIS_PHP_VERSION from install-extensions.sh

Author: glensc

install-extensions.sh

@@ -2,10 +2,9 @@
 
 set -xeu
 
-: "${TRAVIS_PHP_VERSION=7.4}"
 : "${TIDEWAYS_VERSION=4.1.4}"
 : "${TIDEWAYS_XHPROF_VERSION=5.0.2}"
-: "${PHP_VERSION=${TRAVIS_PHP_VERSION}}"
+: "${PHP_VERSION=7.4}"
 
 die() {
 	echo >&2 "ERROR: $*"