Further fix on BoringSSL script

src/objective-c/BoringSSL-GRPC.podspec

@@ -1605,8 +1605,12 @@ Pod::Spec.new do |s|
           "";
     EOF
 
-    sed -i'.back' '/^#define \\([A-Za-z0-9_]*\\) \\1/d' include/openssl/ssl.h
-    sed -i'.back' '$!N;/^#define \\([A-Za-z0-9_]*\\) *\\\\\\n *\\1/d' include/openssl/ssl.h
+    # Remove lines of the format "#define SOME_MACRO SOME_MACRO" because they mess up the symbol prefix
+    sed -i'.back' '/^#define \\([A-Za-z0-9_]*\\) \\1/d' include/openssl/*.h
+    # Remove lines of the format below because they mess up the symbol prefix
+    #     #define SOME_MACRO \
+    #         SOME_MACRO
+    sed -i'.back' '/^#define.*\\\\$/{N;/^#define \\([A-Za-z0-9_]*\\) *\\\\\\n *\\1/d;}' include/openssl/*.h
     sed -i'.back' 's/#ifndef md5_block_data_order/#ifndef GRPC_SHADOW_md5_block_data_order/g' crypto/fipsmodule/md5/md5.c
     find . -type f \\( -path '*.h' -or -path '*.cc' -or -path '*.c' \\) -print0 | xargs -0 -L1 sed -E -i'.grpc_back' 's;#include <openssl/;#include <openssl_grpc/;g'
   END_OF_COMMAND

templates/src/objective-c/BoringSSL-GRPC.podspec.template

@@ -1610,8 +1610,12 @@
             "";
       EOF
 
-      sed -i'.back' '/^#define \\([A-Za-z0-9_]*\\) \\1/d' include/openssl/ssl.h
-      sed -i'.back' '$!N;/^#define \\([A-Za-z0-9_]*\\) *\\\\\\n *\\1/d' include/openssl/ssl.h
+      # Remove lines of the format "#define SOME_MACRO SOME_MACRO" because they mess up the symbol prefix
+      sed -i'.back' '/^#define \\([A-Za-z0-9_]*\\) \\1/d' include/openssl/*.h
+      # Remove lines of the format below because they mess up the symbol prefix
+      #     #define SOME_MACRO \
+      #         SOME_MACRO
+      sed -i'.back' '/^#define.*\\\\$/{N;/^#define \\([A-Za-z0-9_]*\\) *\\\\\\n *\\1/d;}' include/openssl/*.h
       sed -i'.back' 's/#ifndef md5_block_data_order/#ifndef GRPC_SHADOW_md5_block_data_order/g' crypto/fipsmodule/md5/md5.c
       find . -type f \\( -path '*.h' -or -path '*.cc' -or -path '*.c' \\) -print0 | xargs -0 -L1 sed -E -i'.grpc_back' 's;#include <openssl/;#include <openssl_grpc/;g'
     END_OF_COMMAND