Fixed compiler warning in combine_mine: format string is not a string literal (potentially insecure) [-Wformat-security]

This shouldn't be a problem as pszMineStateNames is a hardcoded list of strings (which do not contain string literals), it merely silences the warning.

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Building on Mac OS X 10.8.4, Apple LLVM version 4.2 (clang-425.0.28) (based on LLVM 3.2svn)

REDACTED/mp/src/game/server/hl2/combine_mine.cpp:247:39: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
  V_snprintf(tempstr,sizeof(tempstr), pszMineStateNames[m_iMineState] );
                                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Fixed compiler warning in death: format string is not a string literal (potentially insecure) [-Wformat-security]

Building on Mac OS X 10.8.4, Apple LLVM version 4.2 (clang-425.0.28) (based on LLVM 3.2svn)

REDACTED/sp/src/game/client/death.cpp:292:8: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
  Msg( killedwith+2 );
       ^~~~~~~~~~~~