boringssl.sh: fix warning suppression

Author: vszakats

boringssl.sh

@@ -108,7 +108,7 @@ _VER="$1"
       options+=' -DDISABLE_GO=ON'
       options+=' -DDISABLE_PERL=ON'
 
-      CPPFLAGS+=' -Wno-cast-function-type-mismatch'
+      CPPFLAGS+=' -Wno-cast-function-type'
 
       # Patch out to avoid redefinition errors
       sed -i.bak 's/-D_WIN32_WINNT=_WIN32_WINNT_WIN7//g' ./CMakeLists.txt