Add GLAD OpenGL - function-loader library

The GLAD function loader library  is necessary for the renderer. While
it is possible to write one by hand, GLAD gets generated out of the GL
specification and works just fine.

scripts/build.bash

@@ -38,6 +38,20 @@ function list_sources() {
     cd $ENTRY_PATH
 }
 
+function build_dependencies() {
+    SOURCES=$(list_sources $PROJECT_PATH/dependencies/src-c)
+    mkdir -p .build/dependencies
+    rm -f .build/dependencies/*.o
+    for SOURCE in $SOURCES
+    do
+        OBJECT_NAME=$(make_object_name $SOURCE)
+        gcc  -c -o $PROJECT_PATH/.build/dependencies/$OBJECT_NAME \
+                   $PROJECT_PATH/dependencies/src-c/$SOURCE \
+                -I $PROJECT_PATH/dependencies/inc-c
+    done
+    ar -rvs $PROJECT_PATH/.build/archives/voxula-dependencies.a $PROJECT_PATH/.build/dependencies/*.o
+}
+
 function make_include_statements() {
     MODULE_NAME=$1
 
@@ -66,7 +80,9 @@ function build_single_module() {
     do
         echo "> $SOURCE"
         OBJECT_NAME=$(make_object_name $SOURCE)
-        gcc -c -o .build/modules/$MODULE_NAME/objects/$OBJECT_NAME -g3 modules/$MODULE_NAME/src-c/$SOURCE $INCLUDE_STATEMENTS
+            gcc -c -o .build/modules/$MODULE_NAME/objects/$OBJECT_NAME \
+                -g3 -Wall -Wextra -Wpedantic \
+            modules/$MODULE_NAME/src-c/$SOURCE $INCLUDE_STATEMENTS
     done
 
     if [[ $(ls .build/modules/$MODULE_NAME/objects/ | grep ".o$") == "" ]];
@@ -82,10 +98,12 @@ function build_single_module() {
 mkdir -p .build/archives
 rm -f .build/archives/*.a
 
+build_dependencies
+
 MODULE_LIST=$(list_modules "modules")
 for MODULE in $MODULE_LIST
 do
     build_single_module $MODULE 
 done
 
-gcc -g3 -o voxula .build/archives/*.a
+gcc -g3 -o voxula .build/archives/*.a .build/archives/*.a -lSDL2 -lGL