Do not add backup file with sed

Author: sharkwouter

build-all.sh

@@ -50,6 +50,6 @@ fi
 ## Store build information
 BUILD_FILE="${PSPDEV}/build.txt"
 if [[ -f "${BUILD_FILE}" ]]; then
-  sed -i='' '/^psptoolchain-extra /d' "${BUILD_FILE}"
+  sed -i'' '/^psptoolchain-extra /d' "${BUILD_FILE}"
 fi
 git log -1 --format="psptoolchain-extra %H %cs %s" >> "${BUILD_FILE}"