emulators/qmc2: Prep-work for Qt 5.15; compatible with Qt 5.14

In Qt 5.15 an enumeration is introduced which has enumerators
True and False, used like QCborSimpleType::False. In C++ that's
3 tokens, one name. The C Preprocessor deals with tokens, though,
and since some headers #define False 0, we end up with tokens
QCborSimpleType::0 instead, which is nonsense.

The actual defines are only relevant in C code internals, not the
API for lzma that is used from C++. So somewhat-hackishly just switch
off the #defines when in C++ mode.

The change is complicated by this *particular* source file being
in DOS CRLF mode.

Reported by:	tcberner

emulators/qmc2/Makefile

@@ -3,7 +3,7 @@
 
 PORTNAME=	qmc2
 PORTVERSION=	0.195
-PORTREVISION=	2
+PORTREVISION=	3
 CATEGORIES=	emulators
 MASTER_SITES=	SF
 
@@ -17,7 +17,7 @@ OPTIONS_DEFINE=	DOCS
 
 NO_WRKSUBDIR=	yes
 
-USES=		compiler:c++11-lang gl gmake qt:5 sdl tar:bzip2 xorg
+USES=		compiler:c++11-lang dos2unix gl gmake qt:5 sdl tar:bzip2 xorg
 USE_XORG=	x11 xmu
 USE_GL=		gl glu
 USE_QT=		buildtools_build core declarative gui multimedia \
@@ -40,6 +40,12 @@ DESKTOP_ENTRIES="QMC2" "MAME frontend" "${DATADIR}/img/mame.png" \
 		"CHDMAN GUI" "Qt CHDMAN GUI" "${DATADIR}/img/qchdman.png" \
 		"qchdman" "Game;Emulator;Qt;" "true" \
 
+# This seems to be third-party, and has DOS line-endings. It also
+# needs to be patched because of a confusing build error: #define True 1
+# is a bad idea in C++ code that *also* uses True as an identifier
+# in some scopes.
+DOS2UNIX_FILES=	qmc2/lzma/7zTypes.h
+
 post-patch:
 	@${CP} ${FILESDIR}/Makefile ${WRKSRC}
 	@(cd ${WRKSRC}/qmc2/inst; ${SED} -e 's|DATADIR|${PREFIX}/share|' \

emulators/qmc2/files/patch-qmc2_lzma_7zTypes.h

@@ -0,0 +1,23 @@
+This avoids errors list the following, where True is a C++
+identifier used in scoped context; the #define eats it.
+
+/usr/local/include/qt5/QtCore/qcborstreamreader.h:143:76: error: expected unqualified-id
+    bool isFalse() const            { return isSimpleType(QCborSimpleType::False); }
+                                                                           ^
+lzma/7zTypes.h:98:15: note: expanded from macro 'False'
+#define False 0
+
+--- qmc2/lzma/7zTypes.h.orig	2020-05-30 14:14:41 UTC
++++ qmc2/lzma/7zTypes.h
+@@ -94,8 +94,11 @@ typedef size_t SizeT;
+ #endif
+ 
+ typedef int Bool_7z;
++#ifndef __cplusplus
++/* Only for library internals */
+ #define True 1
+ #define False 0
++#endif
+ 
+ 
+ #ifdef _WIN32