release: reassign FBSHA1=1 so value can be available to makefile

- when getting the sha-1 value from git, reassign FBSHA1 so value is available to the makefile

Author: jayrm

makefile

@@ -447,10 +447,9 @@ ifdef ENABLE_STANDALONE
 endif
 ifdef FBSHA1
   ifeq ($(FBSHA1),1)
-    ALLFBCFLAGS += -d 'FBSHA1="$(shell git rev-parse HEAD)"'
-  else
-    ALLFBCFLAGS += -d 'FBSHA1="$(FBSHA1)"'
+    FBSHA1="$(shell git rev-parse HEAD)"
   endif
+  ALLFBCFLAGS += -d 'FBSHA1="$(FBSHA1)"'
 endif
 ifdef ENABLE_SUFFIX
   ALLFBCFLAGS += -d 'ENABLE_SUFFIX="$(ENABLE_SUFFIX)"'