Remove generation of C/C++ header files (not used anymore after removal of "sis-gdal" module).

More paranoiac check for rounding errors in `normalizeColumns()`.

Author: desruisseaux

core/sis-referencing/src/main/java/org/apache/sis/referencing/operation/matrix/MatrixSIS.java

@@ -447,7 +447,7 @@ public MatrixSIS normalizeColumns() {
                     dot.setFrom(sum);
                     dot.inverseDivide(tmp);
                     set(j, i, dot);
-                    if (Math.abs(dot.doubleValue()) == 1) {
+                    if (Math.abs(dot.doubleValue()) >= 1) {
                         rowOfOne = j;
                     }
                 }

pom.xml

@@ -670,7 +670,6 @@
           <compilerArgs>
             <arg>-Xlint:all</arg>
             <arg>-Xdoclint:syntax,html,missing/protected,accessibility/protected</arg>
-            <arg>-h</arg> <arg>${project.build.sourceDirectory}/../c</arg>
           </compilerArgs>
         </configuration>
       </plugin>