Remove #include <inttypes.h> from BoringSSL

Apple hasn’t created a module map for that system header, which means
it can’t be used from frameworks.

src/objective-c/BoringSSL.podspec

@@ -115,6 +115,16 @@ Pod::Spec.new do |s|
       }
     EOF
 
+    # #include <inttypes.h> fails to compile when building a dynamic framework. libgit2 in
+    # https://github.com/libgit2/libgit2/commit/1ddada422caf8e72ba97dca2568d2bf879fed5f2 and libvpx
+    # in https://chromium.googlesource.com/webm/libvpx/+/1bec0c5a7e885ec792f6bb658eb3f34ad8f37b15
+    # work around it by removing the include. We need four of its macros, so we expand them here.
+    sed -E -i '.back' '/<inttypes.h>/d' include/openssl/bn.h
+    sed -E -i '.back' 's/PRIu32/"u"/g' include/openssl/bn.h
+    sed -E -i '.back' 's/PRIx32/"x"/g' include/openssl/bn.h
+    sed -E -i '.back' 's/PRIu64/"llu"/g' include/openssl/bn.h
+    sed -E -i '.back' 's/PRIx64/"llx"/g' include/openssl/bn.h
+
     # This is a bit ridiculous, but requiring people to install Go in order to build is slightly
     # more ridiculous IMO. To save you from scrolling, this is the last part of the podspec.
     # TODO(jcanizales): Translate err_data_generate.go into a Bash or Ruby script.