[compiler-rt][sanitizers] Fix Solaris madvise declaration

[ro]

Summary

A last-minute silent change in D84046 broke the Solaris buildbots (Solaris/sparcv9, Solaris/amd64):

[2/3679] Building CXX object projects/compiler-rt/lib/sanitizer_common/CMakeFiles/RTSanitizerCommonLibc.sparc.dir/sanitizer_posix_libcdep.cpp.o
FAILED: projects/compiler-rt/lib/sanitizer_common/CMakeFiles/RTSanitizerCommonLibc.sparc.dir/sanitizer_posix_libcdep.cpp.o 
/opt/llvm-buildbot/bin/c++  -DHAVE_RPC_XDR_H=1 -D_DEBUG -D_FILE_OFFSET_BITS=64 -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -Iprojects/compiler-rt/lib/sanitizer_common -I/opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/llvm/compiler-rt/lib/sanitizer_common -Iinclude -I/opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/llvm/llvm/include -I/opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/llvm/llvm/include/llvm/Support/Solaris -I/opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/llvm/compiler-rt/lib/sanitizer_common/.. -fPIC -fvisibility-inlines-hidden -Werror=date-time -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wno-missing-field-initializers -pedantic -Wno-long-long -Wimplicit-fallthrough -Wno-maybe-uninitialized -Wno-noexcept-type -Wdelete-non-virtual-dtor -Wno-comment -fdiagnostics-color -ffunction-sections -fdata-sections -Wall -std=c++14 -Wno-unused-parameter -O3     -m32 -fPIC -fno-builtin -fno-exceptions -fomit-frame-pointer -funwind-tables -fno-stack-protector -fvisibility=hidden -fno-lto -O3 -g -Wno-variadic-macros -Wno-non-virtual-dtor -fno-rtti -Wframe-larger-than=570 -UNDEBUG -std=c++14 -MD -MT projects/compiler-rt/lib/sanitizer_common/CMakeFiles/RTSanitizerCommonLibc.sparc.dir/sanitizer_posix_libcdep.cpp.o -MF projects/compiler-rt/lib/sanitizer_common/CMakeFiles/RTSanitizerCommonLibc.sparc.dir/sanitizer_posix_libcdep.cpp.o.d -o projects/compiler-rt/lib/sanitizer_common/CMakeFiles/RTSanitizerCommonLibc.sparc.dir/sanitizer_posix_libcdep.cpp.o -c /opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/llvm/compiler-rt/lib/sanitizer_common/sanitizer_posix_libcdep.cpp
/opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/llvm/compiler-rt/lib/sanitizer_common/sanitizer_posix_libcdep.cpp:50:16: error: conflicting declaration of C function ‘int madvise(caddr_t, std::size_t, int)’
 extern "C" int madvise(caddr_t, size_t, int);
                ^~~~~~~
In file included from /opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/llvm/compiler-rt/lib/sanitizer_common/sanitizer_posix_libcdep.cpp:32:0:
/usr/include/sys/mman.h:232:12: note: previous declaration ‘int madvise(void*, std::size_t, int)’
 extern int madvise(void *, size_t, int);
            ^~~~~~~

This patch undoes that change.

Tested on amd64-pc-solaris2.11 (Solaris 11.4 and OpenIndiana).

Will commit shortly as obvious to unbreak the build.

compiler-rt/lib/sanitizer_common/sanitizer_posix_libcdep.cpp

 // that, it was never implemented.  So just define it to zero.
 #undef MAP_NORESERVE
 #define MAP_NORESERVE 0
 #endif
 
 #if SANITIZER_SOLARIS
 // Illumos' declaration of madvie cannot be made visible if _XOPEN_SOURCE
 // is defined as g++ does on Solaris.
-extern "C" int madvise(caddr_t, size_t, int);
+extern "C" int madvise(void *, size_t, int);
 #endif
 
 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
 
 namespace __sanitizer {
 
 u32 GetUid() {
   return getuid();