Bump Externals/cryptopp from `78a64e3` to `48377ca`

Created by: dependabot[bot]

Bumps Externals/cryptopp from 78a64e3 to 48377ca.

Commits

• 48377ca Rename PowerPC specific files
• ab7f885 Fix CPU_ProbePMULL on PowerPC
• 0039595 Fix SIGIL on PowerPC during cpu feature probes (GH #1115)
• 9d05539 Fix use of bitwise OR with booleans in rsa.cpp (GH #1114)
• 6a3b34f Fix GCC incorrectly removing code (GH #1112)
• bfbf76f Update g_PowerPcDetectionDone variable name
• 1ab0014 Fix PowerPC feature detection
• 5e5808a Update cryptest.sh for ARM NEON
• 458a69f Fix Cygwin NonblockingRng build due to missing O_NOFOLLOW
• 2ef3254 Fix NonblockingRng on Solaris
• Additional commits viewable in compare view

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