[libcalamares] Fix build

- drop now-obsolete boost-warnings.h
 - add missing namespace alias to GlobalStorage.h (removed accidentally
   in previous commit)

src/libcalamares/GlobalStorage.cpp

@@ -29,6 +29,7 @@
 
 #ifdef WITH_PYTHON
 #include "PythonHelper.h"
+namespace bp = boost::python;
 #endif
 
 using CalamaresUtils::operator""_MiB;

src/libcalamares/utils/boost-warnings.h

@@ -1,30 +0,0 @@
-#ifdef __clang__
-#pragma clang diagnostic push
-#pragma clang diagnostic ignored "-Wreserved-id-macro"
-#pragma clang diagnostic ignored "-Wold-style-cast"
-#pragma clang diagnostic ignored "-Wzero-as-null-pointer-constant"
-#pragma clang diagnostic ignored "-Wextra-semi-stmt"
-#pragma clang diagnostic ignored "-Wall"
-#pragma clang diagnostic ignored "-Wimplicit-float-conversion"
-#pragma clang diagnostic ignored "-Wundef"
-#pragma clang diagnostic ignored "-Wdeprecated-dynamic-exception-spec"
-#pragma clang diagnostic ignored "-Wshadow-field-in-constructor"
-#pragma clang diagnostic ignored "-Wshadow"
-#pragma clang diagnostic ignored "-Wmissing-noreturn"
-#pragma clang diagnostic ignored "-Wcast-qual"
-#pragma clang diagnostic ignored "-Wcast-align"
-#pragma clang diagnostic ignored "-Wsign-conversion"
-#pragma clang diagnostic ignored "-Wdouble-promotion"
-#pragma clang diagnostic ignored "-Wredundant-parens"
-#pragma clang diagnostic ignored "-Wweak-vtables"
-#pragma clang diagnostic ignored "-Wdeprecated"
-#pragma clang diagnostic ignored "-Wmissing-field-initializers"
-#pragma clang diagnostic ignored "-Wdisabled-macro-expansion"
-#pragma clang diagnostic ignored "-Wdocumentation"
-#pragma clang diagnostic ignored "-Wcomma"
-#pragma clang diagnostic ignored "-Wunused-parameter"
-#pragma clang diagnostic ignored "-Wunused-template"
-
-// Actually for Python headers
-#pragma clang diagnostic ignored "-Wreserved-id-macro"
-#endif