Fix some warnings found in build testing.

arch/arm/src/stm32/stm32_adc.c

@@ -3649,6 +3649,7 @@ static uint32_t adc_sqrbits(FAR struct stm32_dev_s *priv, int first, int last,
  * Name: adc_offset_set
  ****************************************************************************/
 
+#ifdef CONFIG_STM32_ADC_LL_OPS
 #ifdef HAVE_IP_ADC_V2
 static int adc_offset_set(FAR struct stm32_adc_dev_s *dev, uint8_t ch,
                           uint8_t i, uint16_t offset)
@@ -3705,6 +3706,7 @@ errout:
   return ret;
 }
 #endif
+#endif /* CONFIG_STM32_ADC_LL_OPS */
 
 /****************************************************************************
  * Name: adc_set_ch

binfmt/binfmt_execmodule.c

@@ -48,7 +48,6 @@
 
 #include <nuttx/arch.h>
 #include <nuttx/kmalloc.h>
-#include <nuttx/mm/mm.h>
 #include <nuttx/mm/shm.h>
 #include <nuttx/binfmt/binfmt.h>
 

binfmt/libelf/libelf_load.c

@@ -49,7 +49,9 @@
 #include <errno.h>
 #include <debug.h>
 
+#include <nuttx/arch.h>
 #include <nuttx/addrenv.h>
+#include <nuttx/mm/mm.h>
 #include <nuttx/binfmt/elf.h>
 
 #include "libelf.h"
@@ -302,10 +304,12 @@ int elf_load(FAR struct elf_loadinfo_s *loadinfo)
       goto errout_with_buffers;
     }
 
+#ifdef CONFIG_BUILD_KERNEL
   /* Initialize the user heap */
 
   umm_initialize((FAR void *)CONFIG_ARCH_HEAP_VBASE,
                  up_addrenv_heapsize(&loadinfo->addrenv));
+#endif
 #endif
 
   /* Load ELF section data into memory */

sched/sched/sched_note.c

@@ -216,6 +216,7 @@ void note_spincommon(FAR struct tcb_s *tcb, FAR volatile spinlock_t *spinlock,
  *
  ****************************************************************************/
 
+#if defined(CONFIG_SCHED_NOTE_GET) || defined(CONFIG_DEBUG_ASSERTIONS)
 static unsigned int note_length(void)
 {
   unsigned int head = g_note_info.ni_head;
@@ -228,6 +229,7 @@ static unsigned int note_length(void)
 
   return head - tail;
 }
+#endif
 
 /****************************************************************************
  * Name: note_remove

sched/signal/sig_notification.c

@@ -47,6 +47,8 @@
 #include <debug.h>
 #include <signal.h>
 
+#include <nuttx/signal.h>
+
 #include "sched/sched.h"
 #include "signal/signal.h"