Don't repeat ourselves unnecessarily in the maps.

We can mark a whole version "introduced=" rather than doing every line
separately.

Bug: N/A
Test: builds
Change-Id: I3219edc755a42ce5ff6258efb744fb5e05967a3a
diff --git a/libdl/libdl.map.txt b/libdl/libdl.map.txt
index 985082e..002e9f8 100644
--- a/libdl/libdl.map.txt
+++ b/libdl/libdl.map.txt
@@ -35,9 +35,9 @@
 
 LIBC_OMR1 { # introduced=27
   global:
-    __cfi_shadow_size; # introduced=27
-    __cfi_slowpath; # introduced=27
-    __cfi_slowpath_diag; # introduced=27
+    __cfi_shadow_size;
+    __cfi_slowpath;
+    __cfi_slowpath_diag;
 } LIBC_N;
 
 LIBC_PLATFORM {