hydrogen.h: Add #ifndef __cplusplus guard for pragma not valid in C++
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This commit wraps the GCC pragma to ignore -Wdeclaration-after-statement
diagnostics in an `#ifndef __cplusplus` guard since this pragma isn't
needed when compiling in C++ mode.
Without this change, I get the following diagnostic from g++ when
compiling a C++ project that includes hydrogen.h:
../subprojects/libhydrogen/hydrogen.h:11:32: warning: option ‘-Wdeclaration-after-statement’ is valid for C/ObjC but not for C++ [-Wpragmas]
11 | #pragma GCC diagnostic ignored "-Wdeclaration-after-statement"
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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This commit wraps the GCC pragma to ignore -Wdeclaration-after-statement diagnostics in an
#ifndef __cplusplusguard since this pragma isn't needed when compiling in C++ mode.Without this change, I get the following diagnostic from g++ when compiling a C++ project that includes hydrogen.h: