ppc-lynx178: move to ada math functions

That version of lynx doesn't not provide all requires symbols for the
math features available in light. Example: sqrtf is not defined.

Thus replace the files pulling the system features to pure Ada
implementation.

llvm-project#21

support/rts_sources/sources.py

@@ -1404,17 +1404,21 @@
             "libgnat/a-naliop.ads",
         ],
         "lynx_srcs": [
-            "hie/a-ngelfu__cert.ads",
-            "hie/a-ngelfu__cert.adb",
-            "hie/a-nlelfu__cert.ads",
-            "hie/a-nuelfu__cert.ads",
-            "hie/s-gcmain__cert.ads",
-            "hie/s-gcmain__cert.adb",
-            "hie/a-nllefu__cert.ads",
-            "hie/a-nuaufl__light.ads",
-            "hie/a-nalofl__light.ads",
-            "hie/a-nallfl__light.ads",
-            "libgnat/a-naliop.ads",
+            "hie/a-ngelfu__ada.ads",
+            "hie/a-ngelfu__ada.adb",
+            "hie/a-nlelfu__ada.ads",
+            "hie/a-nuelfu__ada.ads",
+            "hie/s-gcmain__ada.ads",
+            "hie/s-gcmain__ada.adb",
+            "hie/s-libdou__ada.ads",
+            "hie/s-libdou__ada.adb",
+            "hie/s-libsin__ada.ads",
+            "hie/s-libsin__ada.adb",
+            "hie/s-lidosq__ada.ads",
+            "hie/s-lisisq__ada.ads",
+            "hie/s-libm__ada.ads",
+            "hie/s-libm__ada.adb",
+            "hie/s-libpre__ada.ads",
         ],
         "pikeos_srcs": [
             "hie/a-ngelfu__ada.ads",
@@ -1464,6 +1468,7 @@
         "conditions": ["Add_Math_Lib:!no", "CPU_Family:!x86,!x86_64"],
         "bb_srcs": ["libgnat/a-nllefu.ads"],
         "freertos_srcs": ["libgnat/a-nllefu.ads"],
+        "lynx_srcs": ["libgnat/a-nllefu.ads"],
         "pikeos_srcs": ["libgnat/a-nllefu.ads"],
     },
     "math/long_long_80bit": {
@@ -1516,24 +1521,28 @@
         "conditions": ["Add_Math_Lib:softfloat,hardfloat_dp"],
         "bb_srcs": ["hie/s-lisisq__ada.adb"],
         "freertos_srcs": ["hie/s-lisisq__ada.adb"],
+        "lynx_srcs": ["hie/s-lisisq__ada.adb"],
         "pikeos_srcs": ["hie/s-lisisq__ada.adb"],
     },
     "math/softdp": {
         "conditions": ["Add_Math_Lib:softfloat,hardfloat_sp"],
         "bb_srcs": ["hie/s-lidosq__ada.adb"],
         "freertos_srcs": ["hie/s-lidosq__ada.adb"],
+        "lynx_srcs": ["hie/s-lidosq__ada.adb"],
         "pikeos_srcs": ["hie/s-lidosq__ada.adb"],
     },
     "math/hardsp": {
         "conditions": ["Add_Math_Lib:hardfloat,hardfloat_sp"],
         "bb_srcs": ["hie/s-lisisq__fpu.adb"],
         "freertos_srcs": ["hie/s-lisisq__fpu.adb"],
+        "lynx_srcs": ["hie/s-lisisq__fpu.adb"],
         "pikeos_srcs": ["hie/s-lisisq__fpu.adb"],
     },
     "math/harddp": {
         "conditions": ["Add_Math_Lib:hardfloat,hardfloat_dp"],
         "bb_srcs": ["hie/s-lidosq__fpu.adb"],
         "freertos_srcs": ["hie/s-lidosq__fpu.adb"],
+        "lynx_srcs": ["hie/s-lidosq__fpu.adb"],
         "pikeos_srcs": ["hie/s-lidosq__fpu.adb"],
     },
     # Arithmetic