struct Process becomes struct process

This is for consistency with other structures, and ultimately with
Linux coding style.  The typedef ("Process") was dropped as well for
this reason.

This opportunity was used to fix coding style around the impacted
lines.
diff --git a/ltrace-elf.c b/ltrace-elf.c
index f4f4375..c147ad8 100644
--- a/ltrace-elf.c
+++ b/ltrace-elf.c
@@ -65,7 +65,7 @@
 #endif
 
 int
-default_elf_add_plt_entry(struct Process *proc, struct ltelf *lte,
+default_elf_add_plt_entry(struct process *proc, struct ltelf *lte,
 			  const char *a_name, GElf_Rela *rela, size_t ndx,
 			  struct library_symbol **ret)
 {
@@ -102,7 +102,7 @@
 
 #ifndef ARCH_HAVE_ADD_PLT_ENTRY
 enum plt_status
-arch_elf_add_plt_entry(struct Process *proc, struct ltelf *lte,
+arch_elf_add_plt_entry(struct process *proc, struct ltelf *lte,
 		       const char *a_name, GElf_Rela *rela, size_t ndx,
 		       struct library_symbol **ret)
 {
@@ -541,7 +541,7 @@
 }
 
 static int
-populate_plt(struct Process *proc, const char *filename,
+populate_plt(struct process *proc, const char *filename,
 	     struct ltelf *lte, struct library *lib,
 	     int latent_plts)
 {
@@ -615,7 +615,7 @@
 }
 
 static int
-populate_this_symtab(struct Process *proc, const char *filename,
+populate_this_symtab(struct process *proc, const char *filename,
 		     struct ltelf *lte, struct library *lib,
 		     Elf_Data *symtab, const char *strtab, size_t size,
 		     struct library_exported_name **names)
@@ -778,7 +778,7 @@
 }
 
 static int
-populate_symtab(struct Process *proc, const char *filename,
+populate_symtab(struct process *proc, const char *filename,
 		struct ltelf *lte, struct library *lib,
 		int symtabs, int exports)
 {
@@ -803,7 +803,7 @@
 }
 
 static int
-read_module(struct library *lib, struct Process *proc,
+read_module(struct library *lib, struct process *proc,
 	    const char *filename, GElf_Addr bias, int main)
 {
 	struct ltelf lte = {};
@@ -943,7 +943,7 @@
 }
 
 int
-ltelf_read_library(struct library *lib, struct Process *proc,
+ltelf_read_library(struct library *lib, struct process *proc,
 		   const char *filename, GElf_Addr bias)
 {
 	return read_module(lib, proc, filename, bias, 0);
@@ -951,7 +951,7 @@
 
 
 struct library *
-ltelf_read_main_binary(struct Process *proc, const char *path)
+ltelf_read_main_binary(struct process *proc, const char *path)
 {
 	struct library *lib = malloc(sizeof(*lib));
 	if (lib == NULL)