build(deps): bump Externals/cryptopp from `78a64e3` to `7e0f678`

Created by: dependabot[bot]

Bumps Externals/cryptopp from 78a64e3 to 7e0f678.

Commits

• 7e0f678 Use CPPFLAGS when testign features
• 9e2da89 Move --sysroot to LDFLAGS since not used during compilation
• 24601ac Update cryptest-android.sh
• adcc89c Fix CET and Specter tests for C++03
• f12b441 Update comments (GH #1036)
• 0a1f580 Update vs2005 project files
• bbb29e9 Clear MSVC warning
• 5107611 Clear MSVC warning
• b51383c Fix compile on CentOS 5
• ef3a9e8 Fix compile on CentOS 5
• Additional commits viewable in compare view

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