General: Resolve warnings related to missing declarations

src/video_core/engines/fermi_2d.cpp

@@ -28,7 +28,7 @@ void Fermi2D::CallMethod(const GPU::MethodCall& method_call) {
     }
 }
 
-std::pair<u32, u32> DelimitLine(u32 src_1, u32 src_2, u32 dst_1, u32 dst_2, u32 src_line) {
+static std::pair<u32, u32> DelimitLine(u32 src_1, u32 src_2, u32 dst_1, u32 dst_2, u32 src_line) {
     const u32 line_a = src_2 - src_1;
     const u32 line_b = dst_2 - dst_1;
     const u32 excess = std::max<s32>(0, line_a - src_line + src_1);

src/video_core/shader/control_flow.cpp

@@ -587,8 +587,6 @@ bool TryQuery(CFGRebuildState& state) {
     return true;
 }
 
-} // Anonymous namespace
-
 void InsertBranch(ASTManager& mm, const BlockBranchInfo& branch_info) {
     const auto get_expr = ([&](const Condition& cond) -> Expr {
         Expr result{};
@@ -655,6 +653,8 @@ void DecompileShader(CFGRebuildState& state) {
     state.manager->Decompile();
 }
 
+} // Anonymous namespace
+
 std::unique_ptr<ShaderCharacteristics> ScanFlow(const ProgramCode& program_code, u32 start_address,
                                                 const CompilerSettings& settings,
                                                 Registry& registry) {

src/video_core/textures/decoders.cpp

@@ -11,6 +11,7 @@
 #include "video_core/textures/texture.h"
 
 namespace Tegra::Texture {
+namespace {
 
 /**
  * This table represents the internal swizzle of a gob,
@@ -174,6 +175,8 @@ void SwizzledData(u8* const swizzled_data, u8* const unswizzled_data, const bool
     }
 }
 
+} // Anonymous namespace
+
 void CopySwizzledData(u32 width, u32 height, u32 depth, u32 bytes_per_pixel,
                       u32 out_bytes_per_pixel, u8* const swizzled_data, u8* const unswizzled_data,
                       bool unswizzle, u32 block_height, u32 block_depth, u32 width_spacing) {

src/video_core/textures/decoders.h

@@ -56,8 +56,7 @@ void UnswizzleSubrect(u32 subrect_width, u32 subrect_height, u32 dest_pitch, u32
                       u32 bytes_per_pixel, u8* swizzled_data, u8* unswizzled_data, u32 block_height,
                       u32 offset_x, u32 offset_y);
 
-void SwizzleKepler(const u32 width, const u32 height, const u32 dst_x, const u32 dst_y,
-                   const u32 block_height, const std::size_t copy_size, const u8* source_data,
-                   u8* swizzle_data);
+void SwizzleKepler(u32 width, u32 height, u32 dst_x, u32 dst_y, u32 block_height,
+                   std::size_t copy_size, const u8* source_data, u8* swizzle_data);
 
 } // namespace Tegra::Texture