Move MOZ_SOURCE_REPO

PKGBUILD

@@ -72,7 +72,6 @@ ac_add_options --enable-update-channel=release
 ac_add_options --with-distribution-id=org.archlinux
 export MOZILLA_OFFICIAL=1
 export MOZ_TELEMETRY_REPORTING=1
-export MOZ_SOURCE_REPO=${_repo@Q}
 export MOZ_ADDON_SIGNING=1
 export MOZ_REQUIRE_SIGNING=1
 
@@ -107,12 +106,13 @@ build() {
   CPPFLAGS+=" -O2"
 
   export PATH="$srcdir/path:$PATH"
+  export MOZ_SOURCE_REPO="$_repo"
 
   # Do PGO
   #xvfb-run -a -n 95 -s "-extension GLX -screen 0 1280x1024x24" \
   #  make -f client.mk build MOZ_PGO=1
   make -f client.mk build
-  MOZ_SOURCE_REPO="$_repo" ./mach buildsymbols
+  ./mach buildsymbols
 }
 
 package() {