Fix array expansion

The for loop was wrongly expanded as a single multiline variable in zsh.
Fixed.

Test: manual inspection
Bug: 138854687
Change-Id: I062d11a7a3b883a6687299fe3c219f681395df08
Signed-off-by: Alessio Balsini <balsini@google.com>
diff --git a/envsetup.sh b/envsetup.sh
index eb37f1e..7bdef85 100644
--- a/envsetup.sh
+++ b/envsetup.sh
@@ -37,7 +37,7 @@
 cat ${ROOT_DIR}/${BUILD_CONFIG}
 
 # List of prebuilt directories shell variables to incorporate into PATH
-PREBUILTS_PATHS="
+PREBUILTS_PATHS=(
 LINUX_GCC_CROSS_COMPILE_PREBUILTS_BIN
 LINUX_GCC_CROSS_COMPILE_ARM32_PREBUILTS_BIN
 CLANG_PREBUILT_BIN
@@ -45,9 +45,9 @@
 DTC_PREBUILTS_BIN
 LIBUFDT_PREBUILTS_BIN
 BUILDTOOLS_PREBUILT_BIN
-"
+)
 
-for PREBUILT_BIN in ${PREBUILTS_PATHS}; do
+for PREBUILT_BIN in "${PREBUILTS_PATHS[@]}"; do
     PREBUILT_BIN=\${${PREBUILT_BIN}}
     eval PREBUILT_BIN="${PREBUILT_BIN}"
     if [ -n "${PREBUILT_BIN}" ]; then