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cc1: Use void as base type of void poinetrs

Void pointers were using char as base type and it was confusing the
function eqtype() which was declaring that char pointers and void
pointers were the same type.

--- a/src/cmd/cc/cc1/amd64-sysv.c

+++ b/src/cmd/cc/cc1/amd64-sysv.c

@@ -198,7 +198,7 @@

 	sizettype = &arch.sizettype;

 	arch.va_list_type = *mktype(&arch.va_type, ARY, 1, NULL);

-	arch.pvoidtype.type = &arch.chartype;

+	arch.pvoidtype.type = &arch.voidtype;

 	arch.valid_va_list = local_valid_va_list;

 	return &arch;

--- a/src/cmd/cc/cc1/arm64-sysv.c

+++ b/src/cmd/cc/cc1/arm64-sysv.c

@@ -198,7 +198,7 @@

 	sizettype = &arch.sizettype;

 	arch.va_list_type = *mktype(&arch.va_type, ARY, 1, NULL);

-	arch.pvoidtype.type = &arch.chartype;

+	arch.pvoidtype.type = &arch.voidtype;

 	arch.valid_va_list = local_valid_va_list;

 	arch.zero.type = inttype;

 	arch.one.type = inttype;

--- a/src/cmd/cc/cc1/i386-sysv.c

+++ b/src/cmd/cc/cc1/i386-sysv.c

@@ -204,7 +204,7 @@

 	};

 	arch.valid_va_list = local_valid_va_list;

-	arch.pvoidtype.type = &arch.chartype;

+	arch.pvoidtype.type = &arch.voidtype;

 	arch.va_list_type.type = &arch.longtype;

 	return &arch;

--- a/src/cmd/cc/cc1/z80-scc.c

+++ b/src/cmd/cc/cc1/z80-scc.c

@@ -203,7 +203,7 @@

 		},

 	};

 	arch.valid_va_list = local_valid_va_list;

-	arch.pvoidtype.type = &arch.chartype;

+	arch.pvoidtype.type = &arch.voidtype;

 	arch.va_type.type = &arch.inttype;

 	return &arch;

--- a/tests/cc/execute/scc-tests.lst

+++ b/tests/cc/execute/scc-tests.lst

@@ -189,7 +189,7 @@

 0196-invalidchar.c

 0197-cppcomment.c

 0198-nullcpp.c

-0199-voidpcast.c [TODO]

+0199-voidpcast.c

 0200-cpp.c [TODO]

 0201-cpp.c [TODO]

 0202-variadic.c [TODO]