Fix PX4IO to run C++ static ctors

nuttx/configs/px4io/common/ld.script

@@ -74,6 +74,15 @@ SECTIONS
 		_etext = ABSOLUTE(.);
 	} > flash
 
+	/*
+	 * Init functions (static constructors and the like)
+	 */
+        .init_section : {
+                _sinit = ABSOLUTE(.);
+                KEEP(*(.init_array .init_array.*))
+                _einit = ABSOLUTE(.);
+        } > flash
+
 	.ARM.extab : {
 		*(.ARM.extab*)
 	} > flash

nuttx/configs/px4io/io/defconfig

@@ -345,7 +345,7 @@ CONFIG_DEBUG_INPUT=n
 
 CONFIG_MSEC_PER_TICK=1
 CONFIG_HAVE_CXX=y
-CONFIG_HAVE_CXXINITIALIZE=n
+CONFIG_HAVE_CXXINITIALIZE=y
 CONFIG_MM_REGIONS=1
 CONFIG_MM_SMALL=y
 CONFIG_ARCH_LOWPUTC=y