Removed some unnecessary backslash line continuations. (#12047)

* Removed unnecessary preprocessor line continuations from C++ code.
* Use parentheses to avoid need for line continuations in expressions in Python code.
* Removed line continuations at the end of lists in makefiles.
* cpu/m68000: Regenerated C++ source files.

src/devices/bus/hp_dio/hp98644.cpp

@@ -186,7 +186,7 @@ uint16_t dio16_98644_device::io_r(offs_t offset)
 		break;
 
 	case 1:
-		ret = m_control | m_control << 8 | \
+		ret = m_control | m_control << 8 |
 		(((m_switches->read() >> REG_SWITCHES_INT_LEVEL_SHIFT) & REG_SWITCHES_INT_LEVEL_MASK) << 4);
 		break;
 

src/devices/cpu/alto2/a2emu.cpp

@@ -267,8 +267,8 @@ void alto2_cpu_device::f1_early_emu_block()
 	CPU_CLR_TASK_WAKEUP(m_task);
 	LOG((this,LOG_EMU,2, "   BLOCK %02o:%s\n", m_task, task_name(m_task)));
 #elif   0
-	throw emu_fatalerror(1, "Emulator task want's to BLOCK.\n" \
-			"%s-%04o: r:%02o af:%02o bs:%02o f1:%02o f2:%02o" \
+	throw emu_fatalerror(1, "Emulator task want's to BLOCK.\n"
+			"%s-%04o: r:%02o af:%02o bs:%02o f1:%02o f2:%02o"
 			" t:%o l:%o next:%05o next2:%05o cycle:%lld\n",
 			task_name(m_task), m_mpc,
 			m_rsel, m_daluf, m_dbs, m_df1, mdf2,