upm: musl and gcc8 fixes

gcc8 detects that strncpy is overwiritng the null terminating character
the source strings are already initialized to 0 so memcpy would do the same
job

Fixes
rn2903.c:153:5: error: 'strncpy' output may be truncated copying 16 bytes from a string of length 511 [-Werror=stringop-truncation]
     strncpy(dev->hardware_eui, dev->resp_data, RN2903_MAX_HEX_EUI64);
     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

include sys/types.h for uint definition

uint is defined in sys/types.h, therefore this
header needs to be included, it gets exposed with
musl where this header is not getting included indirectly
as it is happening when building on glibc

Fixes build errors on musl e.g.
upm/src/kx122/kx122.hpp:456:31: error: 'uint' has not been declared
|        void setBufferThreshold(uint samples);
|                                ^~~~

Signed-off-by: Khem Raj <raj.khem@gmail.com>

src/ecezo/ecezo.c

@@ -488,7 +488,7 @@ int ecezo_send_command(const ecezo_context dev, char *cmd, char *buffer,
     // our write buffer
     char writeBuffer[ECEZO_MAX_BUFFER_LEN];
 
-    strncpy(writeBuffer, cmd, ECEZO_MAX_BUFFER_LEN);
+    memcpy(writeBuffer, cmd, ECEZO_MAX_BUFFER_LEN - 1);
     writeBuffer[ECEZO_MAX_BUFFER_LEN - 1] = 0;
 
     int writelen = strlen(writeBuffer);

src/kx122/kx122.h

@@ -31,6 +31,7 @@ extern "C"{
 #include <assert.h>
 #include <unistd.h>
 #include <math.h>
+#include <sys/types.h>
 
 #include <mraa/i2c.h>
 #include <mraa/spi.h>

src/rn2903/rn2903.c

@@ -150,7 +150,7 @@ static rn2903_context _rn2903_postinit(rn2903_context dev,
         rn2903_close(dev);
         return NULL;
     }
-    strncpy(dev->hardware_eui, dev->resp_data, RN2903_MAX_HEX_EUI64);
+    memcpy(dev->hardware_eui, dev->resp_data, RN2903_MAX_HEX_EUI64);
 
     return dev;
 }